Update README.md

Author: sapiens2000

README.md

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 # LOG4U
 
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 [![GitHub commit activity](https://img.shields.io/github/commit-activity/w/prgrms-web-devcourse-final-project%2FWEB3_4_Log4U_BE)](https://github.com/prgrms-web-devcourse-final-project/WEB3_4_Log4U_BE/pulse)
 
 ## 서버 주소
 
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 [API 서버](https://log4u.site)
 
 [프론트 서버](https://fe-log4u.vercel.app)
 
 ## 개발 환경 설정
 
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 * 루트 디렉토리(WEB3_4_Log4U_BE)에서 다음 명령 실행
 
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