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

Windows/Azaion.Annotator/Extensions/SynchronizeInvokeExtensions.cs

@@ -0,0 +1,14 @@
+using System.ComponentModel;
+
+namespace Azaion.Annotator;
+
+public static class SynchronizeInvokeExtensions
+{
+	public static void InvokeEx<T>(this T t, Action<T> action) where T : ISynchronizeInvoke
+	{
+		if (t.InvokeRequired)
+			t.Invoke(action, [t]);
+		else
+			action(t);
+	}
+}