Update README.md

hdf5/README.md

 # Incorparating node local storage in HDF5
-Author: Huihuo Zheng <huihuo.zheng@anl.gov>
+Authors: Huihuo Zheng <huihuo.zheng@anl.gov>, Venkatram Vishwanath <venkat@anl.gov>
 
 This folder contains the prototype of system-aware HDF5 incoroprating node-local 
 storage. This is part of the ExaHDF5 ECP project lead by Suren Byna <sbyna@lbl.gov>.