add structure

lib/model/base_model.dart

@@ -0,0 +1,36 @@
+import 'package:flutter/foundation.dart';
+import 'package:fcs/model/api_helper.dart';
+import 'package:fcs/model/main_model.dart';
+
+import '../vo/setting.dart';
+import '../vo/user.dart';
+
+abstract class BaseModel extends ChangeNotifier {
+  User user;
+  Setting setting;
+  MainModel mainModel;
+
+  void initUser(User user) async {
+    this.user = user;
+  }
+
+  void initSetting(Setting setting) async {
+    this.setting = setting;
+  }
+
+  void logout();
+
+// request makes http request
+// if token is null
+  dynamic request(
+    String path,
+    method, {
+    dynamic payload,
+    String token,
+    String url,
+  }) async {
+    mainModel.resetPinTimer();
+    return await requestAPI(path, method,
+        payload: payload, token: token, url: url);
+  }
+}