auto update README.md

Author: CheChe903

README.md

@@ -99,6 +99,7 @@
 |19940. 피자 오븐|[링크](./%EB%B0%B1%EC%A4%80/Gold/19940.%E2%80%85%ED%94%BC%EC%9E%90%E2%80%85%EC%98%A4%EB%B8%90/README.md)|
 |19942. 다이어트|[링크](./%EB%B0%B1%EC%A4%80/Gold/19942.%E2%80%85%EB%8B%A4%EC%9D%B4%EC%96%B4%ED%8A%B8/README.md)|
 |20055. 컨베이어 벨트 위의 로봇|[링크](./%EB%B0%B1%EC%A4%80/Gold/20055.%E2%80%85%EC%BB%A8%EB%B2%A0%EC%9D%B4%EC%96%B4%E2%80%85%EB%B2%A8%ED%8A%B8%E2%80%85%EC%9C%84%EC%9D%98%E2%80%85%EB%A1%9C%EB%B4%87/README.md)|
+|2011. 암호코드|[링크](./%EB%B0%B1%EC%A4%80/Gold/2011.%E2%80%85%EC%95%94%ED%98%B8%EC%BD%94%EB%93%9C/README.md)|
 |2023. 신기한 소수|[링크](./%EB%B0%B1%EC%A4%80/Gold/2023.%E2%80%85%EC%8B%A0%EA%B8%B0%ED%95%9C%E2%80%85%EC%86%8C%EC%88%98/README.md)|
 |2096. 내려가기|[링크](./%EB%B0%B1%EC%A4%80/Gold/2096.%E2%80%85%EB%82%B4%EB%A0%A4%EA%B0%80%EA%B8%B0/README.md)|
 |2109. 순회강연|[링크](./%EB%B0%B1%EC%A4%80/Gold/2109.%E2%80%85%EC%88%9C%ED%9A%8C%EA%B0%95%EC%97%B0/README.md)|