Remove the release notes as it is not maintained here

Change-Id: I7e558c23df59cba3668e3f3bcf6ca2413b72e178
Add a contibuting section to index.rst

This should make it look more consistent with the other
projects.

Change-Id: I2a3dd716215e68e2bafed17d059010ccb70d6ccf
Merge "Remove the release notes as it is not maintained here"
Merge "Add a contibuting section to index.rst"