docs: document color methods

[chenjiahan]

Summary

The README previously showed only a few color helpers, making the complete public API difficult to discover.

This PR documents every available color method, explains input and style composition, and links styleText to the official Node.js documentation.

Related Links

• https://nodejs.org/api/util.html#utilstyletextformat-text-options

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ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

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Run ID: c661c92f-3fa9-4f5c-8ac5-aa4e8ed7b489

📥 Commits

Reviewing files that changed from the base of the PR and between 5247f87 and b14b012.

📒 Files selected for processing (1)

• README.md

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📝 Walkthrough

Walkthrough

Updated the README’s Color section to describe color as a wrapper around Node.js util.styleText. Added documentation for accepted input and output types, nested style composition, and a table of supported color methods and their visual effects.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title is concise and accurately summarizes the README documentation update for color methods.
Description check	✅ Passed	The description matches the changeset by explaining the added API documentation and styleText reference.
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.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch chenjiahan/docs-color-methods

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