add GifImage

Currently, there are only a few basic features, and more features will be added in version 2.0

HandyControlDemo/UserControl/Controls/GifImageDemoCtl.xaml.cs

@@ -0,0 +1,17 @@
+using System;
+
+namespace HandyControlDemo.UserControl
+{
+    public partial class GifImageDemoCtl : IDisposable
+    {
+        public GifImageDemoCtl()
+        {
+            InitializeComponent();
+        }
+
+        public void Dispose()
+        {
+            GifImageMain.Dispose();
+        }
+    }
+}