add signin function

lib/pages/login_page.dart

@@ -10,7 +10,7 @@ import 'package:fcs/widget/bubble_indication_painter.dart';
 import 'package:fcs/widget/localization/app_translations.dart';
 import 'package:fcs/widget/progress.dart';
 
-import '../theme/theme.dart' as Theme;
+import '../fcs/common/theme.dart' as Theme;
 import 'forget_password.dart';
 import 'sms_page.dart';
 import 'util.dart';
@@ -82,7 +82,7 @@ class _LoginPageState extends State<LoginPage>
                 : 580.0,
             child: Column(
               mainAxisSize: MainAxisSize.max,
-              children: <Widget>[              
+              children: <Widget>[
                 Padding(
                   padding: EdgeInsets.only(top: 50.0),
                   child: _buildMenuBar(context),
@@ -662,14 +662,13 @@ class _LoginPageState extends State<LoginPage>
     var phoneNumber = signupPhoneNumberController.text;
     try {
       await authModel.signup(name, password, confirmPassword, phoneNumber);
-       Navigator.push(
+      Navigator.push(
         context,
         MaterialPageRoute(
           builder: (context) =>
               SmsCodePage(id: phoneNumber, password: password),
         ),
       );
-      
     } catch (e) {
       showMsgDialog(context, "Error", e.toString());
     } finally {