Update Microsoft.Toolkit.Mvvm/Microsoft.Toolkit.Mvvm.csproj

Co-authored-by: Michael Hawker MSFT (XAML Llama) <[email protected]>

Author: Rosuavio

Microsoft.Toolkit.Mvvm/Microsoft.Toolkit.Mvvm.csproj

@@ -17,7 +17,7 @@
       - StrongReferenceMessenger: a high-performance messaging system that trades weak references for speed.
       - Ioc: a helper class to configure dependency injection service containers.
     </Description>
-    <PackageTags>Windows Community Toolkit;Windows;Community;Toolkit;WCT;UWP;MVVM;MVVMToolkit;observable;Ioc;dependency injection;services;extensions;helpers</PackageTags>
+    <PackageTags>Windows Community Toolkit;Windows;Community;Toolkit;WCT;UWP;WinUI;WPF;Xamarin;Xamarin Forms;Uno;Uno Platform;MVVM;MVVMToolkit;INotifyPropertyChanged;observable;Ioc;dependency injection;services;extensions;helpers</PackageTags>
   </PropertyGroup>
 
   <!-- .NET Standard 2.0 doesn't have the Span<T> and IAsyncEnumerable<T> types -->