Added VS 2012 templates for the Toolkit

Added templates for the SharpDX.Toolkit:
o WP8
o WinRT
o WinRT (XAML)
o Desktop

You mentioned that you wanted some templates for the next release. Since I feel like I am not familiar enough with the API to make a Sample/Tutorial, I thought that I would make some templates, because they seemed easy!

I hope they are ok...Let me know if something needs to be changed,

Cheers,
Paul