[doc] add License to repository

Self-explanatory.

AUTHORS

+Judicael Zounmevo <zounmevo@gmail.com>
+Swann Perarnau <swann@anl.gov>
+Kamil Iskra <iskra@mcs.anl.gov>

CONTRIBUTING.markdown

+Contributing to The Project
+===========================
+
+The following is a set of guidelines for contributing to this project. These
+are guidelines, not rules, so use your best judgement and feel free to propose
+changes.
+
+## Commit Messages Styleguide
+
+- use present tense, imperative mood
+- reference issues and merge requests
+- you can use [Gitlab Flavored Markdown](https://docs.gitlab.com/ee/user/markdown.html)
+
+If you want some help, here is a commit template that you can add to your git
+configuration. Save it to a `my-commit-template.txt` file and use `git config
+commit.template my-config-template.txt` to use it automatically.
+
+```
+# [type] If applied, this commit will...    ---->|
+
+
+# Why this change
+
+# Links or keys to tickets and others
+# --- COMMIT END ---
+# Type can be 
+#    feature
+#    fix (bug fix)
+#    doc (changes to documentation)
+#    style (formatting, missing semi colons, etc; no code change)
+#    refactor (refactoring production code)
+#    test (adding missing tests, refactoring tests; no production code change)
+# --------------------
+# Remember to
+#    Separate subject from body with a blank line
+#    Limit the subject line to 50 characters
+#    Capitalize the subject line
+#    Do not end the subject line with a period
+#    Use the imperative mood in the subject line
+#    Wrap the body at 72 characters
+#    Use the body to explain what and why vs. how
+#    Can use multiple lines with "-" for bullet points in body
+# --------------------
+```
+
+## Signoff on Contributions:
+
+The project uses the [Developer Certificate of
+Origin](https://developercertificate.org/) for copyright and license
+management. We ask that you sign-off all of your commits as certification that
+you have the rights to submit this work under the license of the project (in
+the `LICENSE` file) and that you agree to the DCO.
+
+To signoff commits, use: `git commit --signoff`.
+To signoff a branch after the fact: `git rebase --signoff`

LICENSE

+Copyright (c) 2019, UChicago Argonne, LLC. All Rights Reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are met:
+
+    1. Redistributions of source code must retain the above copyright notice,
+    this list of conditions and the following disclaimer.
+
+    2. Redistributions in binary form must reproduce the above copyright
+    notice, this list of conditions and the following disclaimer in the
+    documentation and/or other materials provided with the distribution.
+
+    3. Neither the name of the copyright holder nor the names of its
+    contributors may be used to endorse or promote products derived from this
+    software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
+ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

src/acl.cpp

+/*******************************************************************************
+ * Copyright 2019 UChicago Argonne, LLC.
+ * (c.f. AUTHORS, LICENSE)
+ *
+ * This file is part of the Argo containers project.
+ * For more info, see https://xgitlab.cels.anl.gov/argo/containers
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+*******************************************************************************/
+
 #include "acl.hpp"
 #include "utils.hpp"
 #include <sys/types.h>

src/acl.hpp

+/*******************************************************************************
+ * Copyright 2019 UChicago Argonne, LLC.
+ * (c.f. AUTHORS, LICENSE)
+ *
+ * This file is part of the Argo containers project.
+ * For more info, see https://xgitlab.cels.anl.gov/argo/containers
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+*******************************************************************************/
+
 #ifndef __ACL_H__
 #define __ACL_H__
 

src/aggregatelogger.cpp

+/*******************************************************************************
+ * Copyright 2019 UChicago Argonne, LLC.
+ * (c.f. AUTHORS, LICENSE)
+ *
+ * This file is part of the Argo containers project.
+ * For more info, see https://xgitlab.cels.anl.gov/argo/containers
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+*******************************************************************************/
+
 #include "aggregatelogger.hpp"
 
 Aggregatelogger::Aggregatelogger(uid_t ruid):

src/aggregatelogger.hpp

+/*******************************************************************************
+ * Copyright 2019 UChicago Argonne, LLC.
+ * (c.f. AUTHORS, LICENSE)
+ *
+ * This file is part of the Argo containers project.
+ * For more info, see https://xgitlab.cels.anl.gov/argo/containers
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+*******************************************************************************/
+
 #ifndef __AGGREGATELOGGER_HPP__
 #define __AGGREGATELOGGER_HPP__
 #include "ilogger.hpp"

src/argo_container.cpp

+/*******************************************************************************
+ * Copyright 2019 UChicago Argonne, LLC.
+ * (c.f. AUTHORS, LICENSE)
+ *
+ * This file is part of the Argo containers project.
+ * For more info, see https://xgitlab.cels.anl.gov/argo/containers
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+*******************************************************************************/
+
 #include "argo_container.hpp"
 #include <algorithm>
 #include <pwd.h>

src/argo_container.hpp

+/*******************************************************************************
+ * Copyright 2019 UChicago Argonne, LLC.
+ * (c.f. AUTHORS, LICENSE)
+ *
+ * This file is part of the Argo containers project.
+ * For more info, see https://xgitlab.cels.anl.gov/argo/containers
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+*******************************************************************************/
+
 #ifndef __COMPUTE_CONTAINER_HPP__
 #define	__COMPUTE_CONTAINER_HPP__
 

src/argo_nodeos_config.cpp

+/*******************************************************************************
+ * Copyright 2019 UChicago Argonne, LLC.
+ * (c.f. AUTHORS, LICENSE)
+ *
+ * This file is part of the Argo containers project.
+ * For more info, see https://xgitlab.cels.anl.gov/argo/containers
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+*******************************************************************************/
+
 #include "headers.hpp"
 #include "common.hpp"
 #include "aggregatelogger.hpp"

src/common.hpp

+/*******************************************************************************
+ * Copyright 2019 UChicago Argonne, LLC.
+ * (c.f. AUTHORS, LICENSE)
+ *
+ * This file is part of the Argo containers project.
+ * For more info, see https://xgitlab.cels.anl.gov/argo/containers
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+*******************************************************************************/
+
 #ifndef  __COMMON_HPP__
 #define __COMMON_HPP__
 

src/container_manager.cpp

+/*******************************************************************************
+ * Copyright 2019 UChicago Argonne, LLC.
+ * (c.f. AUTHORS, LICENSE)
+ *
+ * This file is part of the Argo containers project.
+ * For more info, see https://xgitlab.cels.anl.gov/argo/containers
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+*******************************************************************************/
+
 #include "container_manager.hpp"
 #include "common.hpp"
 #include <sys/mount.h>

src/container_manager.hpp

+/*******************************************************************************
+ * Copyright 2019 UChicago Argonne, LLC.
+ * (c.f. AUTHORS, LICENSE)
+ *
+ * This file is part of the Argo containers project.
+ * For more info, see https://xgitlab.cels.anl.gov/argo/containers
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+*******************************************************************************/
+
 #ifndef __CONTAINER_MANAGER_HPP__
 #define __CONTAINER_MANAGER_HPP__
 #include "utils.hpp"

src/defaults.hpp

+/*******************************************************************************
+ * Copyright 2019 UChicago Argonne, LLC.
+ * (c.f. AUTHORS, LICENSE)
+ *
+ * This file is part of the Argo containers project.
+ * For more info, see https://xgitlab.cels.anl.gov/argo/containers
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+*******************************************************************************/
+
 #ifndef __DEFAULTS_HPP__
 #define __DEFAULTS_HPP__
 

src/filelogger.cpp

+/*******************************************************************************
+ * Copyright 2019 UChicago Argonne, LLC.
+ * (c.f. AUTHORS, LICENSE)
+ *
+ * This file is part of the Argo containers project.
+ * For more info, see https://xgitlab.cels.anl.gov/argo/containers
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+*******************************************************************************/
+
 #include "filelogger.hpp"
 #include "common.hpp"
 #include <string>

src/filelogger.hpp

+/*******************************************************************************
+ * Copyright 2019 UChicago Argonne, LLC.
+ * (c.f. AUTHORS, LICENSE)
+ *
+ * This file is part of the Argo containers project.
+ * For more info, see https://xgitlab.cels.anl.gov/argo/containers
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+*******************************************************************************/
+
 #ifndef __FILELOGGER_HPP__
 #define __FILELOGGER_HPP__
 #include "ilogger.hpp"

src/headers.hpp

+/*******************************************************************************
+ * Copyright 2019 UChicago Argonne, LLC.
+ * (c.f. AUTHORS, LICENSE)
+ *
+ * This file is part of the Argo containers project.
+ * For more info, see https://xgitlab.cels.anl.gov/argo/containers
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+*******************************************************************************/
+
 #ifndef __HEADERS_HPP__
 #define __HEADERS_HPP__
 

src/ilogger.cpp

+/*******************************************************************************
+ * Copyright 2019 UChicago Argonne, LLC.
+ * (c.f. AUTHORS, LICENSE)
+ *
+ * This file is part of the Argo containers project.
+ * For more info, see https://xgitlab.cels.anl.gov/argo/containers
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+*******************************************************************************/
+
 #include "ilogger.hpp"
 #include "utils.hpp"
 #include <sstream>

src/ilogger.hpp

+/*******************************************************************************
+ * Copyright 2019 UChicago Argonne, LLC.
+ * (c.f. AUTHORS, LICENSE)
+ *
+ * This file is part of the Argo containers project.
+ * For more info, see https://xgitlab.cels.anl.gov/argo/containers
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+*******************************************************************************/
+
 #ifndef __LOGGER_HPP__
 #define __LOGGER_HPP__
 

src/int_list_parser.cpp

+/*******************************************************************************
+ * Copyright 2019 UChicago Argonne, LLC.
+ * (c.f. AUTHORS, LICENSE)
+ *
+ * This file is part of the Argo containers project.
+ * For more info, see https://xgitlab.cels.anl.gov/argo/containers
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+*******************************************************************************/
+
 #include "int_list_parser.hpp"
 #include "utils.hpp"
 #include <cstdlib>