fixes bug 1058283 - Make a contribute.json endpoint

Dear ANYONE on the Socorro team, 
please have a look at the new contribute.json file. If you see anything missing or incorrect please say. 

The file [validates](https://contribute.paas.allizom.org/https%253A%252F%252Fraw.githubusercontent.com%252Fpeterbe%252Fsocorro%252Fdf9009fd4860d566a8be0678816c1ea947243fed%252Fcontribute.json) which is a good start. 
Loading this link gives me an error: https://bugzilla.mozilla.org/buglist.cgi?cmdtype=runnamed&namedcmd=All%20Socorro&list_id=11066286

``The search named All Socorro does not exist. ``