add a contribute.json file (bug 1074452)

I did my best to find all the data to populate the json file, but l'm assuming I'll need to make a change or two. 
Could we leave this out. Again since we comprise about 15 repositories, I don't think we want to clone this, but just install it. http://marketplace.readthedocs.org/en/latest/topics/setup.html#list-of-services-and-repositories