auto update README.md

Author: chech2

README.md

@@ -247,6 +247,7 @@
 |2467. 용액|[링크](./%EB%B0%B1%EC%A4%80/Gold/2467.%E2%80%85%EC%9A%A9%EC%95%A1/%EC%9A%A9%EC%95%A1.java)|
 |2473. 세 용액|[링크](./%EB%B0%B1%EC%A4%80/Gold/2473.%E2%80%85%EC%84%B8%E2%80%85%EC%9A%A9%EC%95%A1/README.md)|
 |2493. 탑|[링크](./%EB%B0%B1%EC%A4%80/Gold/2493.%E2%80%85%ED%83%91/%ED%83%91.java)|
+|2571. 색종이 － 3|[링크](./%EB%B0%B1%EC%A4%80/Gold/2571.%E2%80%85%EC%83%89%EC%A2%85%EC%9D%B4%E2%80%85%EF%BC%8D%E2%80%853/%EC%83%89%EC%A2%85%EC%9D%B4%E2%80%85%EF%BC%8D%E2%80%853.java)|
 |2573. 빙산|[링크](./%EB%B0%B1%EC%A4%80/Gold/2573.%E2%80%85%EB%B9%99%EC%82%B0/%EB%B9%99%EC%82%B0.java)|
 |2580. 스도쿠|[링크](./%EB%B0%B1%EC%A4%80/Gold/2580.%E2%80%85%EC%8A%A4%EB%8F%84%EC%BF%A0/README.md)|
 |2589. 보물섬|[링크](./%EB%B0%B1%EC%A4%80/Gold/2589.%E2%80%85%EB%B3%B4%EB%AC%BC%EC%84%AC/README.md)|