Add code of conduct

CODE_OF_CONDUCT.md

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+# Code of Conduct
+
+## Our Pledge
+
+We are committed to providing a welcoming and inclusive environment for everyone contributing to tududi, regardless of experience level, background, or identity.
+
+## Our Standards
+
+**Expected behavior:**
+
+- Be respectful and constructive in all interactions
+- Accept feedback gracefully and give it kindly
+- Focus on what's best for the project and community
+- Show empathy and patience with others
+
+**Unacceptable behavior:**
+
+- Harassment, insults, or personal attacks
+- Trolling, inflammatory comments, or sustained disruption
+- Publishing others' private information without permission
+- Any conduct that would be inappropriate in a professional setting
+
+## Enforcement
+
+Instances of unacceptable behavior may be reported by:
+- Opening a confidential issue
+- Contacting the project maintainer directly
+
+Project maintainers have the right to remove, edit, or reject comments, commits, code, issues, and other contributions that violate this Code of Conduct.
+
+## Scope
+
+This Code of Conduct applies to all project spaces (GitHub repository, issues, discussions, pull requests) and when representing the project in public spaces.
+
+## Attribution
+
+This Code of Conduct is adapted from the [Contributor Covenant](https://www.contributor-covenant.org/), version 2.1.
+
+---
+
+**TL;DR:** Be kind, be professional, help us build something great together.