docs: add code of conduct

Author: marc0der

CODE_OF_CONDUCT.md

@@ -0,0 +1,73 @@
+# Code of Conduct
+
+## Our Commitment
+
+The SDKMAN CLI Native project is committed to providing a safe, welcoming, and harassment-free environment for all contributors, regardless of experience level, background, or identity. We value respectful collaboration and constructive dialogue.
+
+## Our Standards
+
+### Expected Behavior
+
+**Be Respectful and Professional**
+- Treat all community members with courtesy and respect
+- Use welcoming and inclusive language
+- Be patient with newcomers and those learning
+- Accept constructive criticism gracefully
+- Focus on what is best for the project and community
+
+**Engage in Constructive Technical Discussion**
+- Technical disagreements are natural and welcome
+- Debate ideas and approaches, not people
+- Support your positions with reasoning and evidence
+- Be open to changing your mind when presented with better solutions
+- Assume good faith in technical discussions
+
+**Collaborate Before Contributing**
+- Discuss new features or significant changes on our Discord server *before* starting work
+- Small, incremental pull requests are strongly preferred
+- Large "change the world" PRs will not be accepted without prior discussion
+- Seek guidance early to ensure alignment with project direction
+- Be receptive to feedback and willing to iterate
+
+**Respect the Contribution Process**
+- Break large changes into small, reviewable increments
+- Each PR should represent a focused, atomic change
+- Engage in conversation to guide and inform decisions
+- Understand that maintainers may redirect or decline contributions
+
+### Unacceptable Behavior
+
+The following behaviors will not be tolerated:
+
+- Rude, hostile, or aggressive communication
+- Personal attacks, insults, or derogatory comments
+- Harassment of any kind, public or private
+- Publishing others' private information without permission
+- Dismissive or condescending language toward other contributors
+- Deliberately derailing technical discussions
+- Submitting large, undiscussed PRs that disregard project guidelines
+- Any conduct that could reasonably be considered inappropriate in a professional setting
+
+## Scope
+
+This Code of Conduct applies to all project spaces on GitHub, including:
+- Issues and pull requests
+- Code reviews and comments
+- Discussions and wikis
+- Repository documentation
+
+## Enforcement
+
+Violations of this Code of Conduct will not be tolerated. If you experience or witness unacceptable behavior, please report it by contacting the project maintainer.
+
+Reports will be reviewed and investigated. The maintainer will respond as deemed appropriate to the circumstances, which may include warnings, temporary bans, or permanent removal from the project.
+
+All community members are expected to respect the privacy and security of the reporter of any incident.
+
+## Questions or Concerns
+
+If you have questions about this Code of Conduct or how it applies, please reach out on our Discord server or open a discussion on GitHub.
+
+---
+
+*This Code of Conduct is focused on maintaining a professional, collaborative environment where incremental progress and respectful dialogue lead to better software.*