Add Code of Conduct

CODE_OF_CONDUCT.md

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+## CODE OF CONDUCT
+
+### Our Pledge
+
+We, as contributors and maintainers, pledge to make participation in **DevUI** a **welcoming, inclusive, and respectful** experience for everyone, regardless of experience level, gender, sexual orientation, disability, ethnicity, religion, or personal background.
+
+### 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 feedback
+* Focusing on what is best for the community
+* Showing empathy towards other community members
+
+Examples of unacceptable behavior:
+
+* Harassment, intimidation, or discrimination in any form
+* Public or private insults or attacks
+* Trolling, offensive comments, or derogatory jokes
+* Disruptive behavior that interferes with a contributor’s work
+* Sharing someone else’s private information without consent
+
+### Enforcement
+
+Project maintainers are responsible for enforcing this Code of Conduct. Actions may include:
+
+* Warning the offending individual
+* Temporary or permanent removal from the project
+* Reporting to GitHub if necessary
+
+Maintainers are expected to **respond to issues and pull requests respectfully** and **take action when a Code of Conduct violation occurs**.
+
+### Reporting
+
+If you experience or witness behavior that violates this Code of Conduct, please **report it immediately** by contacting the project maintainers at:
+
+**Email:** [[[email protected]](mailto:[email protected])]
+
+All reports will be **kept confidential**.
+
+### Attribution
+
+This Code of Conduct is adapted from the [Contributor Covenant](https://www.contributor-covenant.org), version 2.1.