docs: add CONTRIBUTING.md and CODE_OF_CONDUCT.md

CODE_OF_CONDUCT.md

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+# Contributor Covenant Code of Conduct
+
+## Our Pledge
+
+We as members, contributors, and leaders pledge to make participation in our community a harassment-free experience for everyone, regardless of age, body size, visible or invisible disability, ethnicity, sex characteristics, gender identity and expression, level of experience, education, socio-economic status, nationality, personal appearance, race, caste, color, religion, or sexual identity and orientation.
+
+We pledge to act and interact in ways that contribute to an open, welcoming, diverse, inclusive, and healthy community.
+
+## Our Standards
+
+Examples of behavior that contributes to a positive environment:
+
+* Demonstrating empathy and kindness toward other people
+* Being respectful of differing opinions, viewpoints, and experiences
+* Giving and gracefully accepting constructive feedback
+* Accepting responsibility and apologizing to those affected by our mistakes
+* Focusing on what is best not just for us as individuals, but for the overall community
+
+Examples of unacceptable behavior:
+
+* The use of sexualized language or imagery, and sexual attention or advances of any kind
+* Trolling, insulting or derogatory comments, and personal or political attacks
+* Public or private harassment
+* Publishing others' private information without explicit permission
+* Other conduct which could reasonably be considered inappropriate in a professional setting
+
+## Enforcement Responsibilities
+
+Project maintainers are responsible for clarifying and enforcing our standards and will take appropriate and fair corrective action in response to any behavior they deem inappropriate, threatening, offensive, or harmful.
+
+## Scope
+
+This Code of Conduct applies within all community spaces, and also applies when an individual is officially representing the community in public spaces.
+
+## Enforcement
+
+Instances of abusive, harassing, or otherwise unacceptable behavior may be reported to the project maintainers. All complaints will be reviewed and investigated promptly and fairly.
+
+## Attribution
+
+This Code of Conduct is adapted from the [Contributor Covenant][homepage], version 2.1, available at [https://www.contributor-covenant.org/version/2/1/code_of_conduct.html][v2.1].
+
+[homepage]: https://www.contributor-covenant.org
+[v2.1]: https://www.contributor-covenant.org/version/2/1/code_of_conduct.html

CONTRIBUTING.md

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+# Contributing
+
+Thanks for taking the time to contribute! This is a personal, hobby-maintained project, so please be patient with response times.
+
+## Ground rules
+
+- Open an issue first for anything non-trivial — a feature, a refactor, or a bug you plan to fix — so we can agree on the approach before you write a lot of code.
+- Keep changes small and focused. One logical change per pull request makes review much easier.
+- Match the existing style of the code around you (formatting, naming, structure).
+
+## Bugs and features
+
+1. Search the issues to make sure it hasn't already been reported.
+2. Open an issue describing the problem or idea clearly, including how to reproduce bugs.
+3. If you want to implement it, say so in the issue and link your pull request to it.
+
+## Pull requests
+
+1. Fork the repo (or push a branch if you have write access).
+2. Make your change.
+3. If the project has tests or CI, make sure they pass.
+4. Open a pull request with a clear title and a description of what and why.
+5. Keep the PR scoped; reviewers will ask for changes if something is unclear.
+
+## Security issues
+
+Do **not** report security problems in a public issue. See `SECURITY.md` for how to report privately.
+
+By contributing, you agree that your contributions are licensed under the same license as this project.