feat: add TypeScript lessons and learning panel

- Introduced a new script to check TypeScript lesson files for errors.
- Created a main TypeScript file to render lessons and their details.
- Added lesson definitions with starter and answer codes.
- Implemented a user interface for navigating and running lessons.
- Styled the application with CSS for a better user experience.
- Updated README to reflect the new TypeScript section and usage instructions.

05-es6-plus/06-async-await/README.md

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+# 练习 6：async / await
+
+## 目标
+
+学会用 `async` / `await` 改写一个 Promise 流程。
+
+## 你要练什么
+
+- `async`
+- `await`
+- `try...catch`
+
+## 任务
+
+- 写一个 `async` 函数等待课程配置
+- 成功时渲染结果
+- 失败时更新状态
+
+## 文件
+
+- [starter.html](/Users/lijiaqing/home/wwwroot/front-end-example/05-es6-plus/06-async-await/starter.html)
+- [starter.js](/Users/lijiaqing/home/wwwroot/front-end-example/05-es6-plus/06-async-await/starter.js)
+- [answer.html](/Users/lijiaqing/home/wwwroot/front-end-example/05-es6-plus/06-async-await/answer.html)
+- [answer.js](/Users/lijiaqing/home/wwwroot/front-end-example/05-es6-plus/06-async-await/answer.js)