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/02-spread-and-rest/answer.js

@@ -0,0 +1,24 @@
+const tracks = ["HTML", "CSS", "JavaScript"];
+
+const user = {
+  name: "林晨",
+  stage: "基础阶段",
+};
+
+function sumScores(...scores) {
+  return scores.reduce((total, score) => total + score, 0);
+}
+
+const newTracks = [...tracks, "ES6+"];
+const nextUser = { ...user, stage: "现代 JS" };
+const totalScore = sumScores(88, 91, 95);
+
+document.getElementById("output").textContent = JSON.stringify(
+  {
+    newTracks,
+    nextUser,
+    totalScore,
+  },
+  null,
+  2
+);