新增骨架屏控件

demo/Ursa.Demo/ViewModels/SkeletonDemoViewModel.cs

@@ -0,0 +1,12 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Ursa.Demo.ViewModels
+{
+    public class SkeletonDemoViewModel : ViewModelBase
+    {
+    }
+}