AI Resources Structure

The current resources list aren't structured,
I'm proposing the following structure for learning ai:

sections:
- Mathematics for AI/ML
- Machine Learning
- Advance Machine Learning
- Intro to Deep Learning
- Computer Vision
- Natural Language Processing
- Reinforcement Learning
- Advanced Deep Learning

For each sub section I am proposing the following substructure:
- online courses
- Reading Materials/ Articles
- Books

未指定文件或测试。首先定位当前的 AI 资源列表，然后将其与建议的学习章节以及在线课程、文章和书籍子章节进行比较；当列表遵循该结构且不丢失现有资源时，即表示完成。

由索引模型根据 Issue 内容生成。