How can I reuse my windows monogame project sources building android version?

Hello,
I already have my own window monogame project. It works fine on windows.
I want to build it on android. I have Xamarin license, (it’s student version. I can’t build on visual studio) and I know how to build a monogame app for android. But I have no idea how to reuse my windows monogame project sources building android version.
Sorry for my bad English and Thank you.