docs: add Modern LLM Notebook course to Other Courses section

Author: sanbuphy

README.md

@@ -575,6 +575,10 @@ Our team has also created other courses! Check them out:
 
 **Hands-on Modern RL**: An open-source, hands-on curriculum bridging the gap from basic RL concepts to LLM alignment, RLVR, and advanced Agentic systems.
 
+[![Modern LLM Notebook](https://img.shields.io/badge/MODERN_LLM_NOTEBOOK-0052cc?style=for-the-badge)](https://github.com/walkinglabs/modern-llm-notebook)
+
+**Modern LLM Notebook**: A hands-on course for building modern LLMs from scratch in PyTorch, with 23 runnable Jupyter Notebooks covering tokenizers, attention, MoE, RLHF, inference, evaluation, and distillation.
+
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 ## Star History