Base windows UI is working.

* No joining/leaving networks yet, but they do display.
* Nothing is updated yet after first load of the app.  Need to set up a background task to run updates.

windows/WinUI/NetworksPage.xaml.cs

@@ -0,0 +1,40 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using System.Windows;
+using System.Windows.Controls;
+using System.Windows.Data;
+using System.Windows.Documents;
+using System.Windows.Input;
+using System.Windows.Media;
+using System.Windows.Media.Imaging;
+using System.Windows.Navigation;
+using System.Windows.Shapes;
+
+namespace WinUI
+{
+    /// <summary>
+    /// Interaction logic for NetworksPage.xaml
+    /// </summary>
+    public partial class NetworksPage : UserControl
+    {
+        public NetworksPage()
+        {
+            InitializeComponent();
+        }
+
+        public void setNetworks(List<ZeroTierNetwork> networks)
+        {
+            this.wrapPanel.Children.Clear();
+
+            for (int i = 0; i < networks.Count; ++i)
+            {
+                this.wrapPanel.Children.Add(
+                    new NetworkInfoView(
+                        networks.ElementAt<ZeroTierNetwork>(i)));
+            }
+        }
+    }
+}