Adding production app.yaml to source control

Background: There does not appear to be a production version of
the app.yaml file for the developer.android.com site checked in
anywhere, which strikes me as a bit dangerous; We should be able
to replicate the DAC site entirely from source control.

Change-Id: I119c6052b94fe89e973ebb7e3902a9c0566f83ca
1 file changed