Create CODE_OF_CONDUCT.md (#15)

Author: huayra

CODE_OF_CONDUCT.md

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+# Code of Conduct
+
+In the interest of fostering an open and welcoming environment, we as
+contributors and maintainers pledge to make participation in our project
+and our community a harassment-free experience for everyone.
+
+## Expected Behavior
+
+- Be respectful, considerate, and constructive in all communications.
+- Value diverse perspectives and experiences.
+- Focus on ideas, not individuals.
+- Assume good intentions and engage in positive, open dialogue.
+
+## Unacceptable Behavior
+
+- Harassment, hate speech, or derogatory comments.
+- Personal attacks or demeaning remarks.
+- Any conduct that could be reasonably perceived as unprofessional.
+
+## Reporting Issues
+
+If you experience or witness unacceptable behavior, please contact
+compliance@varnish-software.com. All reports will be handled with confidentiality
+and prompt attention.
+
+*This Code of Conduct is adapted from the Contributor Covenant v2.1*
+(see [Contributor Covenant](https://www.contributor-covenant.org/version/2/1/code_of_conduct.html) for more details).