feat: add prism sample.

demo/Ursa.PrismDialogDemo/App.axaml.cs

@@ -0,0 +1,29 @@
+using Avalonia;
+using Avalonia.Controls.ApplicationLifetimes;
+using Avalonia.Markup.Xaml;
+using Prism.DryIoc;
+using Prism.Ioc;
+using Ursa.PrismExtension;
+
+namespace Ursa.PrismDialogDemo;
+
+public partial class App : PrismApplication
+{
+    public override void Initialize()
+    {
+        AvaloniaXamlLoader.Load(this);
+        base.Initialize();
+    }
+
+    protected override void RegisterTypes(IContainerRegistry containerRegistry)
+    {
+        containerRegistry.Register<MainWindow>();
+        containerRegistry.RegisterUrsaDialogService();
+        containerRegistry.RegisterUrsaDialogView<DefaultDialog>("Default");
+    }
+
+    protected override AvaloniaObject CreateShell()
+    {
+        return Container.Resolve<MainWindow>();
+    }
+}