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/09-final-modern-js/summary-service.js

@@ -0,0 +1,12 @@
+export const baseSummary = {
+  name: "林晨",
+  stage: "ES6+",
+  skills: ["模板字符串", "解构", "展开运算符"],
+};
+
+export const loadExtraSkills = () =>
+  new Promise((resolve) => {
+    setTimeout(() => {
+      resolve(["模块化", "Promise", "async/await"]);
+    }, 700);
+  });