完善契约与客户端、服务端的收发代码

SHH.CameraDashboard/Pages/CameraWall/VideoWall.xaml.cs

@@ -0,0 +1,15 @@
+using System.Windows.Controls;
+
+namespace SHH.CameraDashboard
+{
+    /// <summary>
+    /// VideoWall.xaml 的交互逻辑
+    /// </summary>
+    public partial class VideoWall : UserControl
+    {
+        public VideoWall()
+        {
+            InitializeComponent();
+        }
+    }
+}