Add project files.

App/WeddingBuilder/LifeCycles/AddPageHandler.cs

@@ -0,0 +1,18 @@
+using TheXamlGuy.Framework.Core;
+
+namespace Builder.LifeCycles;
+
+public class AddPageHandler : IMediatorHandler<AddPage>
+{
+    private readonly IProjectContext context;
+
+    public AddPageHandler(IProjectContext context)
+    {
+        this.context = context;
+    }
+
+    public void Handle(AddPage request)
+    {
+        context.Pages.Add(new Page(request.Name));
+    }
+}