Add the license information

app/ui/Model/DeezerArtistItem.cs

-namespace VLC_WINRT.Model
+/**********************************************************************
+ * VLC for WinRT
+ **********************************************************************
+ * Copyright © 2013-2014 VideoLAN and Authors
+ *
+ * Licensed under GPLv2+ and MPLv2
+ * Refer to COPYING file of the official project for license
+ **********************************************************************/
+
+namespace VLC_WINRT.Model
 {
     public class DeezerArtistItem
     {

app/ui/Utility/Commands/VideoPlayer/OpenSubtitleCommand.cs

-using System;
+/**********************************************************************
+ * VLC for WinRT
+ **********************************************************************
+ * Copyright © 2013-2014 VideoLAN and Authors
+ *
+ * Licensed under GPLv2+ and MPLv2
+ * Refer to COPYING file of the official project for license
+ **********************************************************************/
+
+using System;
 using System.Diagnostics;
 using Windows.Storage;
 using Windows.Storage.AccessCache;

app/ui/Utility/Helpers/NativeOperationsHelper.cs

-using System;
+/**********************************************************************
+ * VLC for WinRT
+ **********************************************************************
+ * Copyright © 2013-2014 VideoLAN and Authors
+ *
+ * Licensed under GPLv2+ and MPLv2
+ * Refer to COPYING file of the official project for license
+ **********************************************************************/
+
+using System;
 using System.Runtime.InteropServices;
 using System.Runtime.InteropServices.ComTypes;
 using System.ServiceModel.Security;