新增骨架屏控件

src/Ursa/Controls/Skeleton.cs

@@ -0,0 +1,20 @@
+using Avalonia;
+using Avalonia.Controls;
+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace Ursa.Controls
+{
+    public class Skeleton : ContentControl
+    { 
+
+        public static readonly StyledProperty<bool> IsActiveProperty =
+            AvaloniaProperty.Register<Skeleton, bool>(nameof(IsActive)); 
+        public bool IsActive
+        {
+            get { return GetValue(IsActiveProperty); }
+            set { SetValue(IsActiveProperty, value); }
+        } 
+    }
+}