docs: add badges to README.md

- 메인 리드미에 스택 뱃지 추가

README.md

@@ -1,7 +1,15 @@
-# Web Service
+# ft_transcendence
 
 > Real-time Multiplayer Pong Game with Chat, OAuth
 
+![Docker](https://img.shields.io/badge/docker-%230db7ed.svg?style=for-the-badge&logo=docker&logoColor=white)
+![Postgres](https://img.shields.io/badge/postgres-%23316192.svg?style=for-the-badge&logo=postgresql&logoColor=white)
+![NestJS](https://img.shields.io/badge/nestjs-%23E0234E.svg?style=for-the-badge&logo=nestjs&logoColor=white)
+![NextJS](https://img.shields.io/badge/Next-black?style=for-the-badge&logo=next.js&logoColor=white)
+![Unity](https://img.shields.io/badge/unity-%23000000.svg?style=for-the-badge&logo=unity&logoColor=white)
+![WebGL](https://img.shields.io/badge/WebGL-990000?logo=webgl&logoColor=white&style=for-the-badge)
+![Socket.io](https://img.shields.io/badge/Socket.io-black?style=for-the-badge&logo=socket.io&badgeColor=010101)
+
 <br/><br/>
 
 <img width="1626" alt="Screen Shot 2023-11-03 at 6 29 10 PM" src="https://github.com/42Seoul-LastDance/ft_transcendence/assets/87380790/c7b8889d-083b-4045-adb1-0460844dd72c">