Added an /api/routes.json endpoint to document valid routes.
Added an /api/routes.json endpoint to document valid routes.

jrmhaig/tv-wall-pong,connected-tv/tv-wall-pong,connected-tv/tv-wall-pong,johnbeech/tv-wall-pong,jrmhaig/tv-wall-pong,johnbeech/tv-wall-pong,connected-tv/tv-wall-pong,jrmhaig/tv-wall-pong,johnbeech/tv-wall-pong