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.

04-dom-events-async/04-click-counter/README.md

@@ -0,0 +1,25 @@
+# 练习 4：点击计数器
+
+## 目标
+
+学会给按钮绑定点击事件，并更新页面数据。
+
+## 你要练什么
+
+- `addEventListener`
+- 点击事件
+- 数字状态更新
+- DOM 渲染
+
+## 任务
+
+- 点击加一按钮时计数加 1
+- 点击减一按钮时计数减 1
+- 点击重置按钮时恢复为 0
+
+## 文件
+
+- [starter.html](/Users/lijiaqing/home/wwwroot/front-end-example/04-dom-events-async/04-click-counter/starter.html)
+- [starter.js](/Users/lijiaqing/home/wwwroot/front-end-example/04-dom-events-async/04-click-counter/starter.js)
+- [answer.html](/Users/lijiaqing/home/wwwroot/front-end-example/04-dom-events-async/04-click-counter/answer.html)
+- [answer.js](/Users/lijiaqing/home/wwwroot/front-end-example/04-dom-events-async/04-click-counter/answer.js)