add is admin to user entity

app/User/User.php

@@ -9,6 +9,7 @@ class User
     public function __construct(
         private int $id,
         private EmailAddress $email,
+        private bool $isAdmin = false,
     ) {}
 
     public function getId(): int
@@ -20,4 +21,9 @@ class User
     {
         return $this->email;
     }
+
+    public function isAdmin(): bool
+    {
+        return $this->isAdmin;
+    }
 }