Currently in development, and not feature complete. Available on the Visual Studio extension gallery.
To build this, you'll need the Visual Studio SDK, otherwise you can't even open the project. Nuget will take care of the rest.
Feel free to work on any issues tagged "ready", or ask around in
#rust-gamedev
on irc.mozilla.org for how you can help.
Same as Rust, dual MIT/ASL2. Any contributions made are under this license.