Add project files.

Framework/Core/Templates/TemplateBuilder.cs

@@ -0,0 +1,23 @@
+using Microsoft.Extensions.DependencyInjection;
+using System.Collections.ObjectModel;
+
+namespace TheXamlGuy.Framework.Core;
+
+public class TemplateBuilder : ITemplateBuilder
+{
+    private readonly List<ITemplateDescriptor> descriptors = new();
+
+    public IReadOnlyCollection<ITemplateDescriptor> Descriptors => new ReadOnlyCollection<ITemplateDescriptor>(descriptors);
+
+    public ITemplateBuilder Add<TViewModel, TView>(string name, ServiceLifetime lifetime = ServiceLifetime.Transient)
+    {
+        descriptors.Add(new TemplateDescriptor(typeof(TViewModel), typeof(TView), name, lifetime));
+        return this;
+    }
+
+    public ITemplateBuilder Add<TViewModel, TView>(ServiceLifetime lifetime = ServiceLifetime.Transient)
+    {
+        descriptors.Add(new TemplateDescriptor(typeof(TViewModel), typeof(TView), null, lifetime));
+        return this;
+    }
+}