feat(admin): add unfold admin panel

backend/README.md

@@ -22,6 +22,20 @@ GET  /api/jobs/stats/
 POST /api/jobs/{id}/retry/
 ```
 
+## Admin
+
+The project uses `django-unfold` for the Django admin UI.
+
+```text
+http://localhost:8000/admin/
+```
+
+Create a user:
+
+```powershell
+docker compose exec backend python manage.py createsuperuser
+```
+
 ## Worker
 
 ```powershell