initial multi user feature

app/lib/utils/exit_app.dart

@@ -0,0 +1,20 @@
+import 'dart:io';
+
+import 'package:flutter/services.dart';
+import 'package:riverpod/riverpod.dart';
+import 'package:weblibre/core/logger.dart';
+
+Future<void> exitApp(ProviderContainer container) async {
+  logger.i('Preparing exit');
+
+  await SystemNavigator.pop();
+  logger.i('SystemNavigator popped');
+
+  container.dispose();
+  logger.i('Provider container disposed');
+
+  await Future.delayed(const Duration(seconds: 1)).whenComplete(() {
+    logger.i('Bye !!1');
+    exit(0);
+  });
+}