How to add .cs files as reference in Xamarin Studio?

I’m new to Xamarin Studio and was trying to setup an iOS game project. One issue is that I can’t seem to find a way to add .cs files as reference as in Visual Studio… Is this even possible in Xamarin Studio?

Right click on project -> Add files -> choose your file -> then Xamarin will ask, whether you want add file or link

Thanks man! That was kind of tricky ha ha…

BTW, is there any iOS monogame template/example for Xamarin Studio? I set up my project using the iOS-Universal-Empty template, and now I’m kind of stuck where I am…

There are many examples in web like this: http://jaquadro.com/2013/09/monogame-hello-world-on-mac-os-x-and-xamarin-studio/ They are more or less fresh. I use monogame 6 months, and a lot has changed in that time.