docs: add Contributor Covenant 2.1 Code of Conduct

Author: TheStack-ai

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.
+
+## Our Standards
+
+Examples of behavior that contributes to a positive environment:
+* Using welcoming and inclusive language
+* Being respectful of differing viewpoints and experiences
+* Gracefully accepting constructive criticism
+
+Examples of unacceptable behavior:
+* Trolling, insulting or derogatory comments
+* Public or private harassment
+* Publishing others' private information without permission
+
+## Enforcement
+
+Instances of abusive 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](https://www.contributor-covenant.org/), version 2.1.