Xamarin.Android Intellisense not working in Visual Studio

You can get those files from the above links, Just download it and those files move it manually to C:\Program Files (x86)\Microsoft Visual Studio 12.0\Xml\Schemas or simply just add these schemas within Visual Studio.

https://github.com/atsushieno/monodroid-schema-gen/blob/master/android-layout-xml.xsd
https://github.com/atsushieno/monodroid-schema-gen/blob/master/schemas.android.com.apk.res.android.xsd

References :

http://stackoverflow.com/questions/17245308/xamarin-android-intellisense-not-working-in-visual-studio-2010
https://forums.xamarin.com/discussion/60962/enable-intellisense-for-axml-missing-android-layout-xml-xsd-schemas-android-com-apk-res-androiod