Add Gerrit OAUTH plugin and setup for GitHub

Using v3.5.1 from
https://github.com/davido/gerrit-oauth-provider/releases/download/v3.5.1/gerrit-oauth-provider.jar
5 files changed
tree: 398a6eee1a6266938314b93c84ff5409d862000e
  1. gerrit/
  2. nginx/
  3. simpleid/
  4. .gitignore
  5. sourcearcade.yml
  6. TODO.on.site