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
The README.md was woefully out of date, as it was advertising
Ceres Solver as just a non-linear least squares library.
Change-Id: I9a58fb8b63c08ee3852ffbae955e2ca8c90cd6d9
Sergiu Deitsch