Create injection_container.dart

Implement service locator.

Author: CoderJava

lib/injection_container.dart

@@ -0,0 +1,14 @@
+import 'package:flutter_news_app/core/util/shared_preferences_manager.dart';
+import 'package:get_it/get_it.dart';
+import 'package:shared_preferences/shared_preferences.dart';
+
+final sl = GetIt.instance;
+
+Future<void> init() async {
+  /**
+   * External
+   */
+  final sharedPreferences = await SharedPreferences.getInstance();
+  final sharedPreferencesManager = SharedPreferencesManager.getInstance(sharedPreferences);
+  sl.registerLazySingleton(() => sharedPreferencesManager);
+}