This is an Umbraco Community project that is used to create a Visual Studio Package (.visx) to be installed that allows users to add new project items that are Umbraco specific templates such as SurfaceControllers, WebAPI Controllers etc...
Umbraco Community - Visual Studio Project Items
http://visualstudiogallery.msdn.microsoft.com/8d0ca3f2-c626-4485-8794-0922ea67e949