add signin function

lib/model/main_model.dart

@@ -22,7 +22,7 @@ import 'package:fcs/widget/NetworkConnectivity.dart';
 import '../config.dart';
 import '../vo/status.dart';
 import '../vo/user.dart';
-import 'api_helper.dart';
+import '../fcs/common/api_helper.dart';
 import 'base_model.dart';
 import 'constants.dart';
 import 'firebase_helper.dart';
@@ -97,10 +97,10 @@ class MainModel extends ChangeNotifier {
           phone: '+959123456789',
           mail: 'kbz@gmail.com'),
       PaymentMethod(
-          name: 'PayPal',
-          accountName: 'FCS',
-          link: 'https://www.paypal.com/donate/buttons',
-         ),
+        name: 'PayPal',
+        accountName: 'FCS',
+        link: 'https://www.paypal.com/donate/buttons',
+      ),
     ];
     return methods;
   }