MauiProgram.cs

using CommunityToolkit.Maui;
using Microsoft.Extensions.Logging;

namespace WeatherApp
{
    public static class MauiProgram
    {
        public static MauiApp CreateMauiApp()
        {
            var builder = MauiApp.CreateBuilder();
            builder
                .UseMauiApp<App>()
                // Initialize the .NET MAUI Community Toolkit by adding the below line of code
                .UseMauiCommunityToolkit()
                // After initializing the .NET MAUI Community Toolkit, optionally add additional fonts
                .ConfigureFonts(fonts =>
                {
                    fonts.AddFont("OpenSans-Regular.ttf", "OpenSansRegular");
                    fonts.AddFont("OpenSans-Semibold.ttf", "OpenSansSemibold");
                });

            builder.Services.AddSingleton<IConnectivity>((e) => Connectivity.Current);
            builder.Services.AddSingleton<IGeolocation>((e) => Geolocation.Default);

            builder.Services.AddSingleton<ApiServices>();

            builder.Services.AddSingleton<WeatherPageViewModel>();
            builder.Services.AddSingleton<FavoritesPageViewModel>();

            builder.Services.AddSingleton<WelcomePage>();
            builder.Services.AddSingleton<WeatherPage>();
            builder.Services.AddSingleton<FavoritesPage>();
            

#if DEBUG
            builder.Logging.AddDebug();     
#endif

            return builder.Build();
        }
    }
}