added zwg support

lib/screens/onboarding/auth_provider.dart

@@ -0,0 +1,18 @@
+import 'dart:convert';
+
+import 'package:shared_preferences/shared_preferences.dart';
+
+import '../../models/user_model.dart';
+
+class AuthProvider {
+  // get the user model from shared preferences
+  static Future<UserModel?> getUserModel() async {
+    SharedPreferences prefs = await SharedPreferences.getInstance();
+    String? userModelString = prefs.getString("userModel");
+    if (userModelString != null) {
+      Map<String, dynamic> userModelJson = jsonDecode(userModelString);
+      return UserModel.fromJson(userModelJson);
+    }
+    return null;
+  }
+}