회원관리 API 개발 _ 회원가입, 로그인 (사용자ver, 관리자ver)
:jwt token을 이용
⬇️ build.gradle에 library추가하기
https://suddiyo.tistory.com/entry/Spring-Spring-Security-JWT-%EB%A1%9C%EA%B7%B8%EC%9D%B8-%EA%B5%AC%ED%98%84%ED%95%98%EA%B8%B0-2
https://charactermail.tistory.com/491#google_vignette
https://kyung-a.tistory.com/32
토큰 만들 때 secret key 생성
https://yln2.github.io/ub64/
⬇️ 만들어 주신 분
https://blog.naver.com/PostView.naver?blogId=yln__&logNo=221980845207
https://stackoverflow.com/questions/37046771/base64-encode-string-command-line-windows