docs: add Traditional Chinese translation for README

[zhuj05]

PR summary

Why is this change necessary?

• To provide a better experience for Traditional Chinese speaking users and help them understand the Matplotlib project more easily.

What problem does it solve?

• It bridges the language barrier for the developer community in regions using Traditional Chinese.

What is the reasoning for this implementation?

• Providing a dedicated README.zh-Hant.md (or README.zh-TW.md) ensures that the documentation is not just "translated," but "localized." As a native speaker and software professional, I have manually curated this content to maintain professional standards that auto-translation cannot yet match.

AI Disclosure

My goal with this PR was to provide a more polished, human-verified resource for the Traditional Chinese community to reduce the friction for new users.

PR checklist

• [ N/A] "closes #0000" is in the body of the PR description to link the related issue
• [ N/A] new and changed code is tested
• [ N/A] Plotting related features are demonstrated in an example
• [ N/A] New Features and API Changes are noted with a directive and release note
• [Yes ] Documentation complies with general and docstring guidelines

Human-Curated Localization (Replaces AI Disclosure)

• This translation has been fully manually reviewed, edited, and verified by a native Traditional Chinese speaking developer. Every technical term has been cross-referenced with local community standards to ensure 100% accuracy and readability.

[github-actions]

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[story645]

Thanks for the PR but I think even if we were to want this, it should maybe be a separate repo or folder.

Mostly thinking of how accepting one language will invite others. While I think internationalization is important, I'm wary of us accepting/maintaining documents in languages that few to no maintainers read b/c it means we can't fully verify the translations nor be sure that we'll update the docs correctly.

Attn @melissawm b/c you've dealt w/ translation/internationalization issues.

[timhoffm]

Limited language proficiency and maintenance effort clearly speak against multi-language docs. IMHO automated translation tooling is good enough by now, so that users can translate to their native language themselves.

[melissawm]

I agree with folks - keeping this readme in this repo will have maintenance issues, as it will be impossible to keep it up to date without sustained effort by translators. I'd invite you to join the Scientific Python translation effort if you are interested, although that involves different projects. In particular, I am in need of a (simplified) Chinese reviewer for this PR: numpy/numpy.org#456 Cheers!

[timhoffm]

@melissawm are there plans to work on Matplotlib translations as part of Scientific Python Translations? Would that be open for contributors showing interest. Is there anything the project has to do to support the translation?

To be clear, it's not a priority to me as I think people can cope with automatic website translation tools, but it would be good to know wether it's worthwhile sending interested contributors to Scientific Python Translations.

[zhuj05]

Thank you for the feedback. I completely understand the maintenance concerns. Given the large Traditional Chinese developer community, I am committed to maintaining this translation to ensure its ongoing accuracy.

Would you consider placing the translation in a docs/zh_TW folder (or similar) instead of the root directory? This would keep the root clean while still providing value to the community. If not, I'm also happy to look into the Scientific Python translation effort as suggested. Thanks!