AGENTS.md file for Codex

AGENTS.md

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+# Repository maintenance notes
+
+This project uses a Python virtual environment for development and tests.
+
+## Setting up a development environment
+
+1. Create and activate a virtual environment:
+
+   ```bash
+   python -m venv venv
+   source venv/bin/activate
+   ```
+2. Install the project with its test dependencies:
+   ```bash
+   pip install -e '.[test]'
+   ```
+3. Run the tests:
+   ```bash
+   pytest
+   ```
+
+## Building the documentation
+
+Run the following commands if you want to build the docs locally:
+
+```bash
+cd docs
+pip install -r requirements.txt
+make html
+```