docs(md): add Vietnamese (Tiếng Việt 🇻🇳) translation

[phucbm]

Summary

• Add README.vi.md — full Vietnamese translation of all 113 React interview questions and answers
• Update language links in README.md, README.en.md, README.de.md, README.fr.md, README.pl.md, README.es.md to include [Tiếng Việt 🇻🇳](README.vi.md)

Format

All questions follow the required <details>/<summary> structure per CONTRIBUTING.md. Code blocks are unchanged; only prose is translated. Technical terms (React, JSX, useState, DOM, etc.) remain in English.

Test plan

• Verify README.vi.md renders correctly on GitHub
• Verify language links in all files point to README.vi.md correctly
• Confirm all 113 questions present and properly formatted

🤖 Generated with Claude Code

Summary by CodeRabbit

• Documentation
  • Added Vietnamese language support to the documentation's language selector, making the README available in Vietnamese alongside existing English, Polish, German, Spanish, French, and Ukrainian versions.

[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: ec934819-b79f-43e2-8e89-5d3e0e793d8b

📥 Commits

Reviewing files that changed from the base of the PR and between 40625e2 and 080dc0c.

📒 Files selected for processing (7)

• README.de.md
• README.en.md
• README.es.md
• README.fr.md
• README.md
• README.pl.md
• README.vi.md

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📝 Walkthrough

Walkthrough

Six README files are updated to add Vietnamese language links to their "Read in other languages" navigation sections. Each update modifies line 3 to include a reference to the Vietnamese README translation alongside existing language options.

Changes

Vietnamese Language Links in README Translations

Layer / File(s)	Summary
Add Vietnamese links to README translations README.md, README.en.md, README.de.md, README.pl.md, README.es.md, README.fr.md	All README files are updated to include Vietnamese (README.vi.md) in the language selector within the "Read in other languages" section.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

Poem

🐰 A rabbit hopped through languages fair,
Vietnamese added everywhere!
From German to French, Polish to Spanish too,
Now readers worldwide have a path straight through.
Tiếng Việt joins the chorus today,
In six README tongues, hip-hip-hooray! 🌍

🚥 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 accurately describes the main change: adding Vietnamese translation support to multiple README files.
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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