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/05-promise-basics/answer.js

@@ -0,0 +1,21 @@
+function loadTracks() {
+  return new Promise((resolve) => {
+    setTimeout(() => {
+      resolve(["模板字符串", "模块化", "async/await"]);
+    }, 700);
+  });
+}
+
+const status = document.getElementById("status");
+const output = document.getElementById("output");
+
+status.textContent = "加载中...";
+
+loadTracks()
+  .then((tracks) => {
+    status.textContent = "加载完成";
+    output.textContent = tracks.join("\n");
+  })
+  .catch(() => {
+    status.textContent = "加载失败";
+  });