Building a responsive UI with MAUI

In this section, we will build a simple responsive UI using MAUI. Until MAUI is included with Visual Studio 2022, you will need to ensure you use Visual Studio 2022 Preview:

1. Start a new .NET MAUI app and call it CH12_ResponsiveMAUI.
2. Add a new folder called Api.
3. In the Api folder, add a class called PropertyChangedNotifier and replace its contents with the following code:

   namespace CH12_ResponsiveMAUI.Api
   {
       using System.ComponentModel;
       using System.Runtime.CompilerServices;
    
       public class PropertyChangeNotifier : 
           INotifyPropertyChanged
       {
           public event PropertyChangedEventHandler 
               PropertyChanged;
    
           protected void OnPropertyChanged...