docs: add CODE_OF_CONDUCT.md

CODE_OF_CONDUCT.md

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+# Contributor Code of Conduct
+
+## Our Pledge
+
+Everyone who participates in this project — contributors, maintainers, and users — agrees to make participation a welcoming, respectful experience for all, regardless of background or experience level.
+
+## Our Standards
+
+Positive behavior includes:
+
+- Using clear, welcoming language
+- Respecting different viewpoints and experience levels
+- Accepting constructive feedback graciously
+- Focusing on what is best for the community
+
+Unacceptable behavior includes:
+
+- Personal attacks or derogatory comments
+- Public or private conduct that a reasonable person would consider unprofessional
+- Sharing others private information without consent
+
+## Responsibilities
+
+Project maintainers are responsible for clarifying acceptable behavior and are expected to take appropriate action in response to any unacceptable conduct.
+
+## Scope
+
+This Code of Conduct applies to all project spaces, including the repository, issue tracker, and any other official communication channels.
+
+## Enforcement
+
+Instances of unacceptable behavior may be reported by contacting the project maintainers. All reports will be reviewed and investigated, and will result in a response deemed appropriate to the circumstances. Maintainers are obligated to maintain confidentiality regarding the reporter.
+
+## Attribution
+
+This Code of Conduct is adapted from the [Contributor Covenant](https://www.contributor-covenant.org), version 2.1.