Reorganization of files

App/MainWindow.xaml.cs

@@ -0,0 +1,13 @@
+namespace ModernWpfPlayground
+{
+    /// <summary>
+    /// Interaction logic for MainWindow.xaml
+    /// </summary>
+    public partial class MainWindow
+    {
+        public MainWindow()
+        {
+            InitializeComponent();
+        }
+    }
+}