Add llms.txt for LLM context

[bchewy]

Summary

• Added llms.txt file to provide context about the React Bits project for LLMs
• File placed in public directory to be accessible at reactbits.dev/llms.txt when deployed

Purpose

The llms.txt file helps LLMs understand the React Bits project structure, available components, and how to contribute effectively. This follows the emerging standard of providing project context files for AI assistants.

Changes

• Added comprehensive llms.txt with project overview, component listings, and contribution guidelines
• File will be served at the root path when deployed

🤖 Generated with Claude Code

[DavidHDev]

Feature not requested.