add basic codes

src/Shared/HandyControlDemo_Shared/UserControl/Controls/PinBoxDemoCtl.xaml

@@ -1,7 +1,9 @@
 <UserControl x:Class="HandyControlDemo.UserControl.PinBoxDemoCtl"
              xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
              xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
-             xmlns:userControl="clr-namespace:HandyControlDemo.UserControl"
+             xmlns:hc="https://handyorg.github.io/handycontrol"
              Background="{DynamicResource RegionBrush}">
-    <userControl:UnderConstruction/>
+    <hc:TransitioningContentControl>
+        <hc:PinBox Length="6"/>
+    </hc:TransitioningContentControl>
 </UserControl>