docs: REDME 소개 영상 문구 추가

README.md

@@ -78,4 +78,5 @@
 |                                                          🏅베스트 리뷰어                                                          |                                                           👨‍👩‍👧‍👦팀문화 메이커                                                            |                                                         📖문서화 마스터                                                          |                                                         🔪커밋 슬라이서                                                          |                                                            👨‍💻인프라 마스터                                                            |
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+## 소개 영상
 [![소개 영상](./image/youtube.png)](https://youtu.be/atpizUjsY68)