add .gitreview

A .gitreview file is required to use git review.
More information about git review
https://www.mediawiki.org/wiki/Gerrit/git-review

Change-Id: Ie7cdf16232181d4b8093e61f2d8a3faed9010d4f
1 file changed
tree: a172f66f4f7f180de75c33bcd3e76d9d4a77b58f
  1. .gitreview
  2. a
  3. x