Migrate .NET 3.1/5 WPF guide from dotnet docs (#48)

* add toc/bread changes

* add xaml-services

* add ported wpf content

* add xaml-services info to docfx

* Fix links 1

* Fix links 2

* Fix links 3

* Fix links 4

* Fix links 5

* Fix links 6

* Fix links 7

* Fix xaml-services link

* Fix snippets 1

* Fix snippets 2

* adjust breadcrumb and toc

* remove preserve-view from breadcrumbs

* add empty view to toc item xaml

* update include

* remove contextual toc for vs article :(

dotnet-desktop-guide/net/wpf/fundamentals/snippets/styles-templates-overview/csharp/MainWindow.cs

@@ -0,0 +1,27 @@
+// // Copyright (c) Microsoft. All rights reserved.
+// // Licensed under the MIT license. See LICENSE file in the project root for full license information.
+
+using System.Windows;
+using System.Windows.Data;
+
+namespace IntroToStylingAndTemplating
+{
+    /// <summary>
+    ///     Interaction logic for MainWindow.xaml
+    /// </summary>
+    public partial class MainWindow : Window
+    {
+        private PhotoList _photos;
+
+        public MainWindow()
+        {
+            InitializeComponent();
+        }
+
+        private void WindowLoaded(object sender, RoutedEventArgs e)
+        {
+            _photos = (PhotoList) (Resources["MyPhotos"] as ObjectDataProvider).Data;
+            _photos.Path = "images";
+        }
+    }
+}