Add how to bind enum article (#1056)

* add how to article

* Fix lint

* Fix the code example

* Add missing code

* Update how-to-bind-to-an-enumeration.md

* Update dotnet-desktop-guide/net/wpf/data/how-to-bind-to-an-enumeration.md

Co-authored-by: Tom Dykstra <[email protected]>

Co-authored-by: Tom Dykstra <[email protected]>

dotnet-desktop-guide/net/wpf/data/snippets/how-to-bind-to-an-enumeration/csharp/MainWindow.xaml.cs

@@ -0,0 +1,33 @@
+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 ArticleExample
+{
+    /// <summary>
+    /// Interaction logic for MainWindow.xaml
+    /// </summary>
+    public partial class MainWindow : Window
+    {
+        public MainWindow()
+        {
+            InitializeComponent();
+        }
+
+        private void Button1_Click(object sender, RoutedEventArgs e)
+        {
+            new BindEnum().ShowDialog();
+        }
+    }
+}