- Add .readthedocs.yaml build config (Ubuntu 22.04, Python 3.11)
- Add docs/conf.py with myst-parser for Markdown support
- Add docs/index.md toctree including README and existing docs
- Add docs/readme.md to include root README via myst directive
- Add docs/requirements.txt for Sphinx build dependencies
- Add docs/_build/ to .gitignore
