Add chapter 4 completed solution

Chapter04/Complete/MyMediaCollection/Views/ItemDetailsPage.xaml.cs

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+using Microsoft.Extensions.DependencyInjection;
+using Microsoft.UI.Xaml.Controls;
+using Microsoft.UI.Xaml.Navigation;
+using MyMediaCollection.ViewModels;
+
+namespace MyMediaCollection.Views
+{
+    /// <summary>
+    /// An empty page that can be used on its own or navigated to within a Frame.
+    /// </summary>
+    public sealed partial class ItemDetailsPage : Page
+    {
+        public ItemDetailsPage()
+        {
+            ViewModel = App.HostContainer.Services.GetService<ItemDetailsViewModel>();
+
+            this.InitializeComponent();
+        }
+
+        public ItemDetailsViewModel ViewModel;
+
+        protected override void OnNavigatedTo(NavigationEventArgs e)
+        {
+            base.OnNavigatedTo(e);
+
+            var itemId = (int)e.Parameter;
+
+            if (itemId > 0)
+            {
+                ViewModel.InitializeItemDetailData(itemId);
+            }
+        }
+    }
+}