How do you get the .csproj for iOS on a Mac?

I’m trying to add the Monogame project to my solution from the source on Github in order to try and gain some insight as to why universal iOS games do not resume after an interruption such as an incoming call.

There’s no .csproj file and while I understand that if I were on Windows I would need to run protobuild, in this instance I’m on a Mac. What do I need to do in order to create the project on a Mac?