Add Class Library Project to SAP

Hi,
I have read the you can use XAML in a Shared Asset Project by adding the Class Library Project to it. Does anyone know how to make this work ?

Is there a tutorial on doing this ?

I am doing Android and iOS development using VS2013 with a MAC build server.

I would like to use XAML along with SAP as using the benefits of both platforms would make my life a little easier

I have been searching for awhile looking for the answers but to be honest I have not gone through the whole of this Forum so if anyone else has posted this then I apologize.

Cheers,
Wayne