Add initial project structure and configuration files for iOS and Android

lib/data/models/user.dart

@@ -0,0 +1,27 @@
+import 'package:equatable/equatable.dart';
+
+class User extends Equatable {
+  final String id;
+  final String username;
+  final String email;
+  final String? phoneNumber;
+  
+  const User({
+    required this.id,
+    required this.username,
+    required this.email,
+    this.phoneNumber,
+  });
+  
+  factory User.fromJson(Map<String, dynamic> json) {
+    return User(
+      id: json['id'],
+      username: json['username'],
+      email: json['email'],
+      phoneNumber: json['phone_number'],
+    );
+  }
+  
+  @override
+  List<Object?> get props => [id, username, email, phoneNumber];
+}