Fixed sample, added image

Enterwell.Clients.Wpf.Notifications.Sample/MainWindow.xaml

@@ -101,34 +101,3 @@
         </WrapPanel>
     </Grid>
 </mahapps:MetroWindow>
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Readme.md

@@ -118,21 +118,36 @@ The `WithOverlay` allows you to set custom overlay content. In this example a pr
 
 ### Custom additional content for notification
 
+![Notification message with additional content - checkbox at the bottom](docs/images/CaptureNotificationMessageAdditionalContent.PNG)
+
 ```c#
 manager.CreateMessage()
-       .Accent("#F15B19")
-       .Background("#F15B19")
-       .HasHeader("Lost connection to server")
-       .HasMessage("Reconnecting...")
-       .WithAdditionalContent(ContentLocation.Main, new CheckBox
-	   {
-           Margin = new Thickness(16),
-		   HorizontalAlignment = HorizontalAlignment.Right,
-		   Content = "Don't show again"
-	   })
+       .Accent("#1751C3")
+       .Background("#333")
+       .HasBadge("Info")
+       .HasHeader("Update available")
+       .HasMessage("Update will be installed on next application restart.")
+       .Dismiss().WithButton("Update now", button => { })
+       .Dismiss().WithButton("Later", button => { })
+       .WithAdditionalContent(ContentLocation.Bottom,
+       new Border
+       {
+           BorderThickness = new Thickness(0,1,0,0),
+           BorderBrush = new SolidColorBrush(Color.FromArgb(128, 28, 28, 28)),
+           Child = new CheckBox
+           {
+               Margin = new Thickness(12, 8, 12, 8),
+               HorizontalAlignment = HorizontalAlignment.Left,
+               Content = "Don't show again"
+           }
+       })
        .Queue();
 ```
 
+In this example a custom "Don't show again" checkbox is located at the bottom of the message.
+
+You can add additional content to following locations: `Top, Bottom, Left, Right, Main, AboveBadge`.
+
 ### Multiple notification
 
 The `NotificationMessageContainer` has build-in support for showing multiple notifications at the same time. New notifications will show at the bottom of the message stack.