update landing page

README.adoc

@@ -162,8 +162,8 @@ Each sample is tagged with it's difficulty. The degree of difficulty describes h
 | MVVM, Dialog, FileDialogs, TopLevel, Clipboard
 
 | link:src\Avalonia.Samples\ViewInteraction\DialogManagerSample[Dialog Manager Sample]
-| 🐉 Hard
-| MVVM, Dialog, FileDialogs, TopLevel, Clipboard, DialogManager
+| 🐔 Normal
+| MVVM, Dialog, FileDialogs, TopLevel, Clipboard, DialogManager, CommunityToolkit.Mvvm
 
 |===