auto update README.md

Author: yunhoJ

README.md

@@ -107,6 +107,8 @@
 |25192. 인사성 밝은 곰곰이|[링크](./%EB%B0%B1%EC%A4%80/Silver/25192.%E2%80%85%EC%9D%B8%EC%82%AC%EC%84%B1%E2%80%85%EB%B0%9D%EC%9D%80%E2%80%85%EA%B3%B0%EA%B3%B0%EC%9D%B4/README.md)|
 |2563. 색종이|[링크](./%EB%B0%B1%EC%A4%80/Silver/2563.%E2%80%85%EC%83%89%EC%A2%85%EC%9D%B4/README.md)|
 |2751. 수 정렬하기 2|[링크](./%EB%B0%B1%EC%A4%80/Silver/2751.%E2%80%85%EC%88%98%E2%80%85%EC%A0%95%EB%A0%AC%ED%95%98%EA%B8%B0%E2%80%852/README.md)|
+|28278. 스택 2|[링크](./%EB%B0%B1%EC%A4%80/Silver/28278.%E2%80%85%EC%8A%A4%ED%83%9D%E2%80%852/README.md)|
+|28279. 덱 2|[링크](./%EB%B0%B1%EC%A4%80/Silver/28279.%E2%80%85%EB%8D%B1%E2%80%852/README.md)|
 |2839. 설탕 배달|[링크](./%EB%B0%B1%EC%A4%80/Silver/2839.%E2%80%85%EC%84%A4%ED%83%95%E2%80%85%EB%B0%B0%EB%8B%AC/%EC%84%A4%ED%83%95%E2%80%85%EB%B0%B0%EB%8B%AC.java)|
 |2941. 크로아티아 알파벳|[링크](./%EB%B0%B1%EC%A4%80/Silver/2941.%E2%80%85%ED%81%AC%EB%A1%9C%EC%95%84%ED%8B%B0%EC%95%84%E2%80%85%EC%95%8C%ED%8C%8C%EB%B2%B3/README.md)|
 |4673. 셀프 넘버|[링크](./%EB%B0%B1%EC%A4%80/Silver/4673.%E2%80%85%EC%85%80%ED%94%84%E2%80%85%EB%84%98%EB%B2%84/README.md)|