Add ch11 samples

Chapter11/XamlDebugging/MainWindow.xaml

@@ -0,0 +1,17 @@
+<?xml version="1.0" encoding="utf-8"?>
+<Window
+    x:Class="XamlDebugging.MainWindow"
+    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+    xmlns:local="using:XamlDebugging"
+    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+    mc:Ignorable="d">
+
+    <StackPanel DataContext="Test"
+                Background="LightGray">
+        <TextBox x:Name="Text1" 
+                    Text="{Binding Path=SomeText, Mode=TwoWay}"/>
+        <TextBox Text="{Binding ElementName=Text1, Path=Text, Mode=OneWay}"/>
+    </StackPanel>
+</Window>