First stab at new readme

Giving an example of repo-specific checks.

Change-Id: I97faabdc3345e95574d86ea7e6fd678a86c74667
Reviewed-on: https://gerrit.causes.com/22739
Reviewed-by: Aiden Scandella <aiden@causes.com>
Tested-by: Aiden Scandella <aiden@causes.com>
Add changelog

Nothing to see here.

Change-Id: I27600b662cc69c2781da484049b727a08041bb1e
Reviewed-on: https://gerrit.causes.com/22740
Tested-by: Aiden Scandella <aiden@causes.com>
Reviewed-by: Joe Lencioni <joe.lencioni@causes.com>