Add macos build target
Add macos build target

haithemaraissia/CocosSharp,TukekeSoft/CocosSharp,netonjm/CocosSharp,mono/cocos2d-xna,netonjm/CocosSharp,hig-ag/CocosSharp,haithemaraissia/CocosSharp,mono/CocosSharp,mono/cocos2d-xna,TukekeSoft/CocosSharp,mono/CocosSharp,zmaruo/CocosSharp,MSylvia/CocosSharp,MSylvia/CocosSharp,zmaruo/CocosSharp,hig-ag/CocosSharp