docs: add zh-CN readme

[bzp2010]

Summary by CodeRabbit

Documentation

• Added language-switch header to the main README for improved navigation
• Improved token default value formatting in the Inputs table for better clarity
• Added complete Chinese language documentation including ADC setup instructions, usage guidelines, and configuration details

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: b0eac419-f495-47cd-a55e-89b3645b5c72

📥 Commits

Reviewing files that changed from the base of the PR and between 167d51c and 19b4720.

📒 Files selected for processing (2)

• README.md
• README.zh-CN.md

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📝 Walkthrough

Walkthrough

A language-switch header is added to README.md enabling navigation to a Chinese version, and the Inputs table formatting is improved. A new README.zh-CN.md file is created containing comprehensive Chinese documentation for the action, including setup instructions, usage examples, input/output parameters, and license information.

Changes

Multilingual Documentation Support

Layer / File(s)	Summary
Language Navigation README.md (lines 1–4)	Add centered language-switch header with links to Chinese and English versions of documentation.
Chinese Documentation README.zh-CN.md	New Chinese README covering setup instructions, usage with security guidance, input/output parameters, release-note example block, and Apache-2.0 license.
Documentation Clarity README.md (lines 34–37)	Update Inputs table header and token default rendering with code formatting and HTML escaping for improved readability.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

🚥 Pre-merge checks | ✅ 5 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
E2e Test Quality Review	⚠️ Warning	Tests lack scenario coverage (error cases, boundaries, invalid inputs), weak assertions (substring matching), depend on external services without mocking, and miss negative test cases.	Add error scenario tests, boundary case tests, exact version matching assertions, mock external API calls, and improve test documentation.

✅ 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 zh-CN readme' accurately describes the primary change: adding a Chinese README file to the documentation.
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.
Security Check	✅ Passed	No security vulnerabilities found. Token handling is secure with HTML escaping, no hardcoded credentials, and proper GitHub Actions context usage. Documentation includes appropriate security warnings.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch bzp/feat-readme-zhcn

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