Update README.md

README.md

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 - How to Create PR: https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/proposing-changes-to-your-work-with-pull-requests/creating-a-pull-request-from-a-fork
 - Kakao Open chat: https://open.kakao.com/o/gNvIrgPg
 - Example Mock Interview: https://youtu.be/rw4s4M3hFfs?si=rKGoO3lPRm5Xejul  
-- Naver Cafe: https://cafe.naver.com/vancouverkdd (Blind75 챌린지 by KDD)
 - Posting Example: https://leetcode.com/problems/two-sum/solutions/3556832/two-sums-3-easy-methods-in-python/
 - Question List: https://www.designgurus.io/course/grokking-the-coding-interview
 - Useful youtube: https://neetcode.io/practice