initialise method Null safety

Implementation

static Future<void> initialise() async {
  WidgetsFlutterBinding.ensureInitialized();

  await _setupStrings();

  await SystemChrome.setPreferredOrientations([
    DeviceOrientation.portraitUp,
    DeviceOrientation.portraitDown,
  ]);

  await Hive.initFlutter();

  await Locator.setup();
}