Add project files.

App/WeddingBuilder/Views/AddPageViewModel.cs

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+using Builder.LifeCycles;
+using TheXamlGuy.Framework.Core;
+
+namespace Builder;
+
+public class AddPageViewModel : ObservableViewModel
+{
+    public AddPageViewModel(IPropertyBuilder propertyBuilder,
+        IEventAggregator eventAggregator,
+        IServiceFactory serviceFactory,
+        IDisposer disposer) : base(propertyBuilder, eventAggregator, serviceFactory, disposer)
+    {
+
+    }
+
+    public string? Name { get; set; }
+
+    public void Add()
+    {
+        EventAggregator.Publish(new AddPage(Name));
+    }
+}