docs: add Code of conduct

.github/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.
+
+## CONTRIBUTING
+
+* **Commit message must comply with the [Conventional Commits](https://www.conventionalcommits.org/en/v1.0.0/).**
+* **Submitted Code must comply with the [eslint rules](../.eslintrc.cjs).**
+* **Unit Tests must pass**