add admin command

backend/app/User/InitialAdminCredentials.php

@@ -0,0 +1,22 @@
+<?php
+
+namespace App\User;
+
+class InitialAdminCredentials
+{
+    public function __construct(
+        private string $email,
+        private string $password,
+    ) {
+    }
+
+    public function getEmail(): string
+    {
+        return $this->email;
+    }
+
+    public function getPassword(): string
+    {
+        return $this->password;
+    }
+}