Add basic documentation

Add an "About" page with a description of what the plugin does, copied
from core Gerrit's plugin documentation [1].

[1] https://gerrit-review.googlesource.com/Documentation/config-plugins.html#singleusergroup

Change-Id: I959195881bf3dd53d40b00eabd5b2e4ffd94e2b7
2 files changed
tree: 8529bf3f38645de830823d557671e620d5572fec
  1. .gitignore
  2. .settings/
  3. BUCK
  4. LICENSE
  5. src/