AI Resources Structure

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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

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@duttakapil @DakshMiglani