title: Restricted capabilities on UWP apps
body: <p>I want to make screen projection application. And according to MSDN I need a rescap namespace in Package.appxmanifest.
  I Wrote this<code>xmlns:rescap="http://schemas.microsoft.com/appx/manifest/foundation/windows10/restrictedcapabilities"</code>, but namespace does not appears.
  Do I need something more?</p>