I have installed all the tools for development with Xamarin in Visual Studio 2015, but somehow I do not see Blank App (Native) template when I create new project. I am only able
Try this(from msdn):
In Control Panel, open Programs and Features, choose the Xamarin item, and click Change. In the setup wizard for Xamarin that appears, click Next and then Change. In the list of optional features to install, expand Xamarin for Visual Studio 2015, choose will be installed on local drive, and click Next to proceed with adding the feature.