Add MonoGame.Framework.Net reference for Android.
Add MonoGame.Framework.Net reference for Android.

See Issue https://github.com/mono/CocosSharp/issues/254

haithemaraissia/CocosSharp,mono/CocosSharp,MSylvia/CocosSharp,TukekeSoft/CocosSharp,haithemaraissia/CocosSharp,TukekeSoft/CocosSharp,zmaruo/CocosSharp,zmaruo/CocosSharp,mono/CocosSharp,MSylvia/CocosSharp