docs(vi): Add Vietnamese documentation for create-t3-app

[cobeo2004]

✅ Checklist

• I have followed every step in the contributing guide (updated 2022-10-06).
• The PR title follows the convention we established conventional-commit
• I performed a functional test on my final commit

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Changelog

• Finished adding Vietnamese translation for the all the pages.
• Ready to be review at 26 Apr, 2025.

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Screenshots

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Latest commit: a9cd4eb

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Name	Status	Preview	Comments	Updated (UTC)
create-t3-app	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Apr 26, 2025 6:47am

[github-actions]

Hey t3-oss/translators!

This PR contains changes to your language. Please review the changes ❤️.

VI: