Made the splash screen optional

Author: Sergio0694

samples/MvvmSampleUwp/MvvmSampleUwp/Package.appxmanifest

@@ -4,7 +4,8 @@
   xmlns="http://schemas.microsoft.com/appx/manifest/foundation/windows10"
   xmlns:mp="http://schemas.microsoft.com/appx/2014/phone/manifest"
   xmlns:uap="http://schemas.microsoft.com/appx/manifest/uap/windows10"
-  IgnorableNamespaces="uap mp">
+  xmlns:uap5="http://schemas.microsoft.com/appx/manifest/uap/windows10/5"
+  IgnorableNamespaces="uap uap5 mp">
 
   <Identity
     Name="950461c4-1285-4186-b254-9b4be0df2488"
@@ -44,7 +45,7 @@
             <uap:ShowOn Tile="square310x310Logo"/>
           </uap:ShowNameOnTiles>
         </uap:DefaultTile >
-        <uap:SplashScreen Image="Assets\SplashScreen.png"  BackgroundColor="#3750D1"/>
+        <uap:SplashScreen Image="Assets\SplashScreen.png" uap5:Optional="true" BackgroundColor="#3750D1"/>
       </uap:VisualElements>
     </Application>
   </Applications>