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/App.xaml.cs

@@ -0,0 +1,17 @@
+using System;
+using System.Collections.Generic;
+using System.Configuration;
+using System.Data;
+using System.Linq;
+using System.Threading.Tasks;
+using System.Windows;
+
+namespace ArticleExample
+{
+    /// <summary>
+    /// Interaction logic for App.xaml
+    /// </summary>
+    public partial class App : Application
+    {
+    }
+}