new folder structure and new C# script host

src/WPF/AboutWindow.xaml.cs

@@ -0,0 +1,18 @@
+
+using System.Windows;
+using System.Windows.Input;
+
+namespace mpvnet
+{
+    public partial class AboutWindow : Window
+    {
+        public AboutWindow()
+        {
+            InitializeComponent();
+            ContentBlock.Text = App.Version;
+        }
+
+        protected override void OnPreviewKeyDown(KeyEventArgs e) => Close();
+        protected override void OnMouseDown(MouseButtonEventArgs e) => Close();
+    }
+}