Initial WPF content migrated (#17)

* Reset branch for WPF changes

* Convert BMP to PNG; fix link-out-of-scope err

* Add snippets for WPF... 6794 files!!!!

* Add missing snippets

* update file updated between migration

* Fix paths to include

* update breadcrumb and toc

* fix index links

* fix index links

* fix index links

* fix markdown

dotnet-desktop-guide/samples/snippets/csharp/wpf/introduction-to-wpf/introduction-to-wpf_17.cs

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+using System.Windows; // Window, RoutedEventArgs, MessageBox
+
+namespace SDKSample
+{
+    public partial class ControlTemplateButtonWindow : Window
+    {
+        public ControlTemplateButtonWindow()
+        {
+            InitializeComponent();
+        }
+
+        void button_Click(object sender, RoutedEventArgs e)
+        {
+            // Show message box when button is clicked
+            MessageBox.Show("Hello, Windows Presentation Foundation!");
+        }
+    }
+}

dotnet-desktop-guide/samples/snippets/csharp/wpf/introduction-to-wpf/introduction-to-wpf_2.cs

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+namespace SDKSample
+{
+    class Person
+    {
+        string name = "No Name";
+
+        public string Name
+        {
+            get { return name; }
+            set { name = value; }
+        }
+    }
+}

dotnet-desktop-guide/samples/snippets/csharp/wpf/introduction-to-wpf/introduction-to-wpf_34.cs

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+using System; // EventArgs
+using System.Windows; // DependencyObject, DependencyPropertyChangedEventArgs,
+                      // FrameworkPropertyMetadata, PropertyChangedCallback,
+                      // RoutedPropertyChangedEventArgs
+using System.Windows.Controls; // UserControl
+
+namespace SDKSample
+{
+    public partial class NumericUpDown : UserControl
+    {
+        // NumericUpDown user control implementation
+    }
+}

dotnet-desktop-guide/samples/snippets/csharp/wpf/introduction-to-wpf/introduction-to-wpf_6.cs

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+using System.Windows; // Window
+
+namespace SDKSample
+{
+    public partial class DataBindingWindow : Window
+    {
+        public DataBindingWindow()
+        {
+            InitializeComponent();
+
+            // Create Person data source
+            Person person = new Person();
+
+            // Make data source available for binding
+            this.DataContext = person;
+        }
+    }
+}

dotnet-desktop-guide/samples/snippets/csharp/wpf/introduction-to-wpf/introduction-to-wpf_8.cs

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+using System.Windows; // Window, MessageBox
+using System.Windows.Input; // MouseButtonEventHandler
+
+namespace SDKSample
+{
+    public partial class EllipseEventHandlingWindow : Window
+    {
+        public EllipseEventHandlingWindow()
+        {
+            InitializeComponent();
+        }
+
+        void clickableEllipse_MouseUp(object sender, MouseButtonEventArgs e)
+        {
+            // Display a message
+            MessageBox.Show("You clicked the ellipse!");
+        }
+    }
+}