docs: add Code of Conduct

[zichen0116]

Summary

This PR adds a CODE_OF_CONDUCT.md file based on the Contributor Covenant v2.1, establishing clear community guidelines for the Dub project.

Changes

• Added CODE_OF_CONDUCT.md with the full Contributor Covenant Code of Conduct (v2.1)
• Contact email set to security@dub.co (matching the existing SECURITY.md contact)

Why

Having a Code of Conduct helps:

• Set clear expectations for community behavior
• Provide a reference point for handling disputes
• Make the project more welcoming to new contributors
• Align with open-source best practices

The Contributor Covenant is the most widely adopted Code of Conduct in open source, used by projects like Kubernetes, Rails, Swift, and many others.

Checklist

• Follows the Contributor Covenant v2.1 standard
• Contact email matches project's existing security contact
• No breaking changes

Summary by CodeRabbit

• Documentation
  • Added Code of Conduct to establish community standards and guidelines for respectful and inclusive interactions among contributors.

[vercel]

@zichen0116 is attempting to deploy a commit to the Dub Team on Vercel.

A member of the Team first needs to authorize it.

[CLAassistant]

All committers have signed the CLA.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 7c154542-07e4-4f7f-9378-c1613e42f67b

📥 Commits

Reviewing files that changed from the base of the PR and between 2d239f0 and fcefe87.

📒 Files selected for processing (1)

• CODE_OF_CONDUCT.md

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📝 Walkthrough

Walkthrough

This pull request adds a CODE_OF_CONDUCT.md file containing the Contributor Covenant Code of Conduct v2.1, establishing community standards, enforcement procedures, and reporting mechanisms for the project.

Changes

Community Standards and Conduct Documentation

Layer / File(s)	Summary
Code of Conduct Document CODE_OF_CONDUCT.md	Adds complete Contributor Covenant v2.1 with sections covering pledges, behavioral standards, enforcement responsibilities, scope, reporting contact (security@dub.co), privacy assurances, and attribution.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

Poem

🐰 A code of conduct hops into view,
With standards and kindness both honest and true,
The Covenant pledges for all who belong,
A community garden where everyone's strong! ✨

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title 'docs: add Code of Conduct' accurately and concisely describes the main change - adding a CODE_OF_CONDUCT.md file to the repository.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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