Update README.md

README.md

 # AI_science
 
+This tutorial is aimed at students who are interested in learning about Machine Learning techniques. The tutorial relies on IPyhton Notebooks which are targeted for running on [Google's Colaboratory Platform](https://colab.research.google.com). This platform gives the user a virtual machine in which to run python codes including machine learning codes.
+
+# Before You Arrive
+
+Do the following before you come to the tutorial:
+*  You need a Google Account to use Colaboratory
+*  Goto [Google's Colaboratory Platform](https://colab.research.google.com) 
+*  You should see this page
+![start_page](README_imgs/colab_start_page.png)
+*  Click on the `New Python 3 Notebook` at it may say `Python 2` but just click the drop down arrow and select the `Python 3` option.
+*  Now you will see a new notebook where you can type in python code.
+![clean_page](README_imgs/colab_clean_page.png)
+*  After you enter code, type `shift+enter` to execute the code cell.
+*  A full introduction to the notebook environment is out of scope for this tutorial, but many can be found with a [simple google search](https://www.google.com/search?q=jupyter+notebook+tutorial)
+*  We will be using notebooks from this repository during the tutorial, so  you should be familiar with how to import them into Colaboratory
+*  
+