Added MultilineTextEntryView

Bitvault/DropdownValueViewModel.cs

@@ -0,0 +1,11 @@
+using Toolkit.Foundation;
+
+namespace Bitvault;
+
+public partial class DropdownValueViewModel(IServiceProvider provider,
+    IServiceFactory factory,
+    IMediator mediator,
+    IPublisher publisher,
+    ISubscription subscriber,
+    IDisposer disposer, 
+    string? value = null) : Observable<string>(provider, factory, mediator, publisher, subscriber, disposer, value);