Add LearnAI - AI-powered personalized learning for AI/ML

[buildonlabs]

What is LearnAI?

LearnAI is a free AI tutor that generates personalized AI/ML curricula and teaches through conversation. It adapts to each learner's pace and knowledge level.

Why it belongs here: LearnAI is an AI-powered platform specifically designed to help people learn artificial intelligence — fitting naturally in the Courses section.

• Website: https://uselearnai.com/chat?topic=ml
• GitHub: https://github.com/buildonlabs-org/ai-ml-learning-roadmap
• License: MIT
• Free tier available

[buildonlabs]

Hey, wanted to share a quick update on this PR.

We've published a dedicated LearnAI course specifically on AI and machine learning: https://www.uselearnai.com/course/machine-learning

Interactive AI-guided course covering machine learning from linear regression to neural networks, CNNs, RNNs, unsupervised learning, and production model deployment. The full course is free and accessible to anyone, no account required, just open and start learning.

A note on how it works: the curriculum structure is designed by our team, and the actual teaching is delivered by an AI tutor in real-time, personalized to each learner's level and questions, so it adapts as you go rather than serving static content. Happy to adjust the PR description or placement based on your feedback.