Update README.md

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Add Lecture 7 OT and Schrödinger bridge implementations and equation readings

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Add Lecture 6 flow maps with tested training, sampling, and course navigation

Add Lecture 4 discrete diffusion and Lecture 5 discrete flow matching

Update course index, dependencies, and Lecture 3 test paths

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Organize Lectures 2 and 3 examples and refine course documentation

Correct the README license link

Add Lecture 2 flow matching and diffusion guidance examples

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