add WPF example

PocketSharp.Examples/PocketSharp.Wpf/Site.cs

@@ -0,0 +1,14 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace PocketSharp.Wpf
+{
+  public class Site
+  {
+    public string Url { get; set; }
+    public string Content { get; set; }
+  }
+}