Add Content lookup markupextension

Framework/Foundation/Contents/IContentTemplateDescriptor.cs

@@ -0,0 +1,14 @@
+using Microsoft.Extensions.DependencyInjection;
+
+namespace Toolkit.Framework.Foundation;
+
+public interface IContentTemplateDescriptor
+{
+    Type ContentType { get; }
+
+    ServiceLifetime Lifetime { get; }
+
+    string? Name { get; }
+
+    Type TemplateType { get; }
+}