Implement AddUser in ManageUserDisplay

Views/ManageUsersDisplay.cs

@@ -94,7 +94,14 @@ namespace Akari.Provider.WaveshareUART.Views
 
         private void AddButton_Clicked()
         {
+            var dialog = new NewUserDialog();
 
+            if (dialog.TryShow(out var name, out var token))
+            {
+                UsersManager.Add(name.ToString(), token.ToString());
+            }
+
+            UpdateList();
         }
 
         private void DeleteButton_Clicked()