Implemented settings, new scan, enhanced UI/UX

lib/services/erpframe.dart

@@ -5,6 +5,7 @@ import 'package:flutter/cupertino.dart';
 
 class LocalDocuFrameConfiguration {
   String host;
+  String backendUrl;
   final String user;
   final String pass;
   final List<String> appNames;
@@ -15,6 +16,7 @@ class LocalDocuFrameConfiguration {
       required this.appKey,
       required this.appNames,
       required this.pass,
+        required this.backendUrl,
       required this.user});
 
   Map<String, dynamic> toJson() {
@@ -22,6 +24,7 @@ class LocalDocuFrameConfiguration {
       "host": host,
       "user": user,
       "pass": pass,
+      "backendUrl": backendUrl,
       "appNames": appNames,
       "appKey": appKey
     };
@@ -34,6 +37,7 @@ class LocalDocuFrameConfiguration {
         appNames: (getValueOrThrowIfNotPresent("appNames", json) as List)
             .cast<String>(),
         pass: getValueOrThrowIfNotPresent("pass", json),
+        backendUrl: getValueOrThrowIfNotPresent("backendUrl", json),
         user: getValueOrThrowIfNotPresent("user", json));
   }
 }