docs: add CODE_OF_CONDUCT.md

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: cablate

CODE_OF_CONDUCT.md

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+# Code of Conduct
+
+## Our Pledge
+
+We are committed to providing a friendly, safe, and welcoming environment for all contributors, regardless of experience level, background, or identity.
+
+## Our Standards
+
+**Positive behavior includes:**
+- Using welcoming and inclusive language
+- Being respectful of differing viewpoints and experiences
+- Gracefully accepting constructive feedback
+- Focusing on what is best for the community
+
+**Unacceptable behavior includes:**
+- Trolling, insulting comments, or personal attacks
+- Public or private harassment
+- Publishing others' private information without permission
+- Other conduct which could reasonably be considered inappropriate
+
+## Enforcement
+
+Project maintainers are responsible for clarifying standards of acceptable behavior and may take appropriate action in response to any unacceptable behavior.
+
+## Reporting
+
+Instances of unacceptable behavior may be reported to: **reahtuoo310109@gmail.com**
+
+All complaints will be reviewed and investigated promptly and fairly.
+
+## Attribution
+
+This Code of Conduct is adapted from the [Contributor Covenant](https://www.contributor-covenant.org/), version 2.1.