fix: README 코드 블록에 언어 지정 추가

da-in · da-in · commit cb3b1896bcbf · 2026-01-27T15:44:50.000+09:00
diff --git a/README.md b/README.md
@@ -87,7 +87,7 @@ npm start
 
 ## 📌 File Structure
 
-```
+```text
 📦simple-thumbnail
  ┣ 📂.github  # GitHub Actions 워크플로우 및 템플릿
  ┣ 📂public
