feat: Add CSS layout exercises and corresponding HTML files

- Created multiple exercises under the CSS layout section, including:
  - Final page layout with CSS styles and HTML structure.
  - Display and flow concepts with examples of block, inline, and none display types.
  - Selectors and pseudo-classes with practical examples.
  - Overflow and sizing handling in CSS.
  - Grid layout basics for two-dimensional layouts.
  - Fixed and sticky positioning examples.
  - Centering techniques for common layout scenarios.

- Added README files for each exercise to outline objectives and file structures.
- Updated main README to include new sections and usage instructions.

01-html-structure/02-text-links-lists/README.md

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+# 练习 2：文本、链接、列表
+
+## 目标
+
+掌握最常见的内容组织标签。
+
+## 你要练什么
+
+- `h1` 到 `h3`
+- `p`
+- `strong`
+- `em`
+- `a`
+- `ul` / `ol` / `li`
+
+## 任务
+
+请完成一个“前端新手资源页”，要求包含：
+
+- 一个主标题
+- 一个资源介绍段落，段落中要有 `strong` 和 `em`
+- 一个“推荐网站”二级标题
+- 一个无序列表，里面至少 3 个链接
+- 一个“学习步骤”二级标题
+- 一个有序列表，里面至少 4 步
+
+## 检查点
+
+- `a` 是否有 `href`
+- 列表项是否全部在 `li` 中
+- 强调内容是否使用了合适标签
+- 标题层级是否合理
+
+## 文件
+
+- [starter.html](/Volumes/Macintosh HD 1/home/front-end-example/01-html-structure/02-text-links-lists/starter.html)
+- [answer.html](/Volumes/Macintosh HD 1/home/front-end-example/01-html-structure/02-text-links-lists/answer.html)