Update SimpleWavSplitterApp.xaml

SimpleWavSplitter/SimpleWavSplitterApp.xaml

@@ -1,4 +1,6 @@
-<Application x:Class="SimpleWavSplitter.App"
+<!-- Copyright (c) Wiesław Šoltés. All rights reserved. -->
+<!-- Licensed under the MIT license. See LICENSE file in the project root for full license information. -->
+<Application x:Class="SimpleWavSplitter.App"
              xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
              xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
              StartupUri="SimpleWavSplitterWindow.xaml">