Signature screen and link buttons added

* Signature.xaml, signature.xaml.cs added, 2 buttons added to
Confirmgamescreen which should link to the signature screen. the done
button should redirect back to confirm game screen if at least one
stroke has been registered.
Merge remote-tracking branch 'origin/master'

Conflicts:
	icehockeyWA/icehockeyWA/icehockeyWA.csproj