Add project files.

App/WeddingBuilder/LifeCycles/AddPage.cs

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+namespace Builder.LifeCycles;
+
+public record AddPage(string Name);

App/WeddingBuilder/LifeCycles/AddPageHandler.cs

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+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));
+    }
+}

App/WeddingBuilder/LifeCycles/IProjectContext.cs

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+using System.Collections.Generic;
+
+namespace Builder.LifeCycles
+{
+    public interface IProjectContext
+    {
+        ICollection<Page> Pages { get; }
+    }
+}

App/WeddingBuilder/LifeCycles/Page.cs

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+namespace Builder.LifeCycles
+{
+    public record Page(string Name);
+}

App/WeddingBuilder/LifeCycles/ProjectConfiguration.cs

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+namespace Builder.LifeCycles
+{
+    public class ProjectConfiguration
+    {
+
+    }
+}

App/WeddingBuilder/LifeCycles/ProjectContext.cs

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+using System.Collections.Generic;
+
+namespace Builder.LifeCycles
+{
+    public class ProjectContext : IProjectContext
+    {
+        public ICollection<Page> Pages => new List<Page>();
+    }
+
+    public interface IProjectScope
+    {
+
+    }
+}

App/WeddingBuilder/LifeCycles/StartedHandler.cs

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+using Avalonia;
+using Avalonia.Controls.ApplicationLifetimes;
+using TheXamlGuy.Framework.Core;
+
+namespace Builder;
+
+public class StartedHandler : IMediatorHandler<Started>
+{
+    private readonly MainWindow window;
+    private readonly MainWindowViewModel viewModel;
+
+    public StartedHandler(MainWindow window, 
+        MainWindowViewModel viewModel)
+    {
+        this.window = window;
+        this.viewModel = viewModel;
+    }
+
+    public void Handle(Started request)
+    {
+        window.DataContext = viewModel;
+        if (Application.Current?.ApplicationLifetime is IClassicDesktopStyleApplicationLifetime desktop)
+        {
+            desktop.MainWindow = window;
+        }
+    }
+}