Authenticate reviews with Telegram init data

lib/models/place_models.dart

@@ -1,6 +1,38 @@
 import 'package:flutter/material.dart';
 import 'package:latlong2/latlong.dart';
 
+class AppUser {
+  const AppUser({
+    required this.id,
+    required this.telegramId,
+    required this.username,
+    required this.firstName,
+    required this.lastName,
+    required this.photoUrl,
+    required this.languageCode,
+  });
+
+  factory AppUser.fromJson(Map<String, dynamic> json) {
+    return AppUser(
+      id: json['id'] as String,
+      telegramId: json['telegramId'] as String,
+      username: json['username'] as String?,
+      firstName: json['firstName'] as String?,
+      lastName: json['lastName'] as String?,
+      photoUrl: json['photoUrl'] as String?,
+      languageCode: json['languageCode'] as String?,
+    );
+  }
+
+  final String id;
+  final String telegramId;
+  final String? username;
+  final String? firstName;
+  final String? lastName;
+  final String? photoUrl;
+  final String? languageCode;
+}
+
 enum PlaceTrait {
   calm,
   dynamic,