README.md group links by purpose and add Gerrit there Change-Id: Icb15891d4325ad1724647f5d6faf0d17fbb50269 Reviewed-on: https://chromium-review.googlesource.com/349470 Reviewed-by: Jamie Madill <jmadill@chromium.org> Reviewed-by: Geoff Lang <geofflang@chromium.org> Commit-Queue: Geoff Lang <geofflang@chromium.org>