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/ZeroTierNetwork.cs

@@ -0,0 +1,26 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace WinUI
+{
+    public class ZeroTierNetwork
+    {
+        public string nwid;
+        public string mac;
+        public string name;
+        public string status;
+        public string type;
+        public int mtu;
+        public bool dhcp;
+        public bool bridge;
+        public bool broadcastEnabled;
+        public int portError;
+        public int netconfRevision;
+        public string[] multicastSubscriptions;
+        public string[] assignedAddresses;
+        public string portDeviceName;
+    }
+}