tree 41eee54d11cf9e991ff7f4246503ecc194c13540
parent 3df43b960fe30347406358bb2a18973c71df76b7
author Sameer Agarwal <sameeragarwal@google.com> 1531009624 -0700
committer Sameer Agarwal <sameeragarwal@google.com> 1531203387 +0000

Add CONTRIBUTING.md

This was currently being done in README.md, but thats likely not
the best way to do this, CONTRIBUTING.md is shown to users
if they try to create PR on github.

So this CL pulls out the bits that point folks to Gerrit and puts
them in CONTRIBUTING.md

Change-Id: I1d2be0d89cbff72c0655ba341756dd0f54e2ea7f