Add the missing code of conduct to cas-reference-product

CODE_OF_CONDUCT.md

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+# Code of Conduct
+
+## Our commitment
+
+We are committed to a professional, inclusive, and harassment-free community for
+everyone participating in this repository.
+
+## Expected behavior
+
+- Communicate respectfully and focus criticism on the technical work.
+- Be clear about uncertainty, operational risk, and security boundaries.
+- Protect private information, credentials, prompts, and customer data.
+- Accept constructive feedback and correct mistakes transparently.
+- Review AI-assisted contributions before merging them.
+
+## Unacceptable behavior
+
+- Harassment, threats, discrimination, or personal attacks.
+- Publishing another person's private information without permission.
+- Knowingly submitting malicious, deceptive, plagiarized, or unsafe content.
+- Using community channels to disclose exploitable security details.
+
+## Enforcement
+
+Report conduct concerns privately through the repository maintainers or GitHub's
+private reporting channels where appropriate. Maintainers may remove content or
+restrict participation when necessary.