docs: code of conduct (#6084)

docs/CODE_OF_CONDUCT.md

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+# Code of Conduct
+
+We’re building great software through **engineering excellence**, **prioritizing users’ needs**, and **collaboration based on merit and respect**.
+
+Everyone is welcome to contribute by following these guidelines:
+
+**Contribution Acceptance**: We evaluate contributions iteratively based on quality, user needs, and project goals. Discuss plans early to align efforts, as acceptance depends on refinement guided by maintainers’ feedback.
+
+**Equal Treatment**: All contributors are valued equally, regardless of background or beliefs. Discrimination or policies favoring specific groups are not allowed.
+
+**Constructive Criticism**: Share clear, evidence-based and respectful criticism to improve the project.
+
+**Focus on Work**: Avoid fear, uncertainty, doubt (FUD), or personal attacks.
+
+**Relevant Discussions**: Stick to software and project goals, avoiding politics, ideology, or unrelated topics.
+
+Violations may lead to warnings, temporary bans, or removal, at maintainers’ discretion.
+
+Let’s create great software together!