Update README.md

Author: Mingguriguri

_WeeklyChallenges/W01-[TwoPointer]/README.md

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 ### 문제
 - [백준 #1522. 문자열교환](https://www.acmicpc.net/problem/1522): 문자열, 투포인트/ 실버1
 - 정답 코드: Study_1522_문자열교환.py
-- 스터디 Pdf 자료: [바로가기]()
+- 스터디 Pdf 자료: [바로가기](https://github.com/AlgorithmStudy-Allumbus/codingtest_algorithm_study/blob/main/_WeeklyChallenges/W01-%5BTwoPointer%5D/%5B%EC%95%8C%EB%A1%AC%EB%B2%84%EC%8A%A4_%EA%B7%B8%EB%A6%AC%EB%93%9C%EC%95%8C%EA%B3%A0%EB%A6%AC%EC%A6%98%5D_1522%EB%B2%88_%EB%AC%B8%EC%9E%90%EC%97%B4%EA%B5%90%ED%99%98%5D.pdf)
 - 기타 참고하면 좋을 자료:
     - https://da-y-0522.tistory.com/49
     - https://yesdohyun.tistory.com/48