Reorganization of files

App/ContentDialogExample.xaml

@@ -0,0 +1,21 @@
+<ui:ContentDialog
+    x:Class="ModernWpfPlayground.ContentDialogExample"
+    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+    xmlns:ui="http://schemas.modernwpf.com/2019"
+    x:Name="LayoutRoot"
+    Title="Delete your work?"
+    CloseButtonText="Cancel"
+    DefaultButton="Close"
+    IsShadowEnabled="True"
+    PrimaryButtonText="Yes"
+    SecondaryButtonText="No">
+    <ui:SimpleStackPanel
+        HorizontalAlignment="Stretch"
+        VerticalAlignment="Stretch"
+        Spacing="10">
+        <!--  Content body  -->
+        <TextBlock Text="Delete message?" />
+        <TextBlock TextWrapping="Wrap"><Run Text="&quot;" /><Run Text="{Binding Message, ElementName=LayoutRoot}" /><Run Text="&quot;" /></TextBlock>
+    </ui:SimpleStackPanel>
+</ui:ContentDialog>