readme.md code convention 추가

com.twin.app.shoptime/README.md

@@ -83,3 +83,21 @@ SubCategory.jsx 참고(Home)
 # 자막영상
 
 ontv4u 검색 후 첫 영상
+
+# code convention
+
+1.  vs-code extension: js/ts import/export sorter 설치
+
+2.  vs-code setting.json
+
+{
+
+"prettier.tabWidth": 2,
+
+"prettier.printWidth": 80,
+
+"prettier.trailingComma": "es5",
+
+"tsImportSorter.configuration.keepUnused": [".*"],
+
+}