新增骨架屏控件

demo/Ursa.Demo/Pages/SkeletonDemo.axaml.cs

@@ -0,0 +1,14 @@
+using Avalonia.Controls;
+using Ursa.Demo.ViewModels;
+
+namespace Ursa.Demo.Pages
+{
+    public partial class SkeletonDemo : UserControl
+    {
+        public SkeletonDemo()
+        {
+            InitializeComponent();
+            DataContext = new SkeletonDemoViewModel();
+        }
+    }
+}