Task done

Feladat1/Program.cs

@@ -9,10 +9,12 @@ class Program
 {
     static int Main()
     {
+        var serviceProvider = SetupServices();
         var application = Adw.Application.New("org.piper.feladat1", Gio.ApplicationFlags.FlagsNone);
         application.OnActivate += (sender, args) =>
         {
-            var window = new MainWindow().Window;
+            var userService = serviceProvider.GetService<IUserService>();
+            var window = new MainWindow(userService).Window;
             window.Application = (Adw.Application)sender;
             window.Show();
         };