title: Get OS-Version in WinRT Metro App C#
body: <p>I'm programming a Metro Style App with C# and the Visual Studio 11 Beta.
  Now I want to get the OS-Version of the OS. How can I get this?</p>
  
  <p>I found out how to do it in "normal" Applications.
  There you take the Environment-Class with the attribute OSVersion but in .NET Core there isn't this attribute</p>