add user entity

backend/app/User/User.php

@@ -0,0 +1,23 @@
+<?php
+
+namespace App\User;
+
+use App\Shared\ValueObject\EmailAddress;
+
+final readonly class User
+{
+    public function __construct(
+        private int $id,
+        private EmailAddress $email,
+    ) {}
+
+    public function getId(): int
+    {
+        return $this->id;
+    }
+
+    public function getEmail(): EmailAddress
+    {
+        return $this->email;
+    }
+}