Slim Framework mvc design [closed]

I created a small project named chat-app with slim framework but how should the MVC architecture be?

project/
│
├─ app/
│  ├─ Controllers/
│  │  ├─ GroupController.php
│  │  ├─ MessageController.php
│  │
│  ├─ Models/
│  │  ├─ GroupModel.php
│  │  ├─ MessageModel.php
│  │
│  ├─ Services/
│  │  ├─ GroupService.php
│  │  ├─ MessageService.php
│  │
│  ├─ Routes/
│  │  ├─ routes.php
│  │
│  └─ chatapp.sqlite
│
├─ public/
│  ├─ index.php
│  ├─ .htaccess
│
├─ vendor/
│
└─ composer.json

It’s my architecture. Should I add something else or should i change something?

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