move Windows app to Windows folder, create folder for Web, create simplest web api service

Windows/Azaion.Annotator/DTO/MediatrEvents.cs

@@ -0,0 +1,20 @@
+using System.Windows.Input;
+using MediatR;
+
+namespace Azaion.Annotator.DTO;
+
+public class KeyEvent(object sender, KeyEventArgs args) : INotification
+{
+    public object Sender { get; set; } = sender;
+    public KeyEventArgs Args { get; set; } = args;
+}
+
+public class PlaybackControlEvent(PlaybackControlEnum playbackControlEnum) : INotification
+{
+    public PlaybackControlEnum PlaybackControl { get; set; } = playbackControlEnum;
+}
+
+public class VolumeChangedEvent(int volume) : INotification
+{
+    public int Volume { get; set; } = volume;
+}