docs: add husky and lint-staged pre-commit integration guide (#203)

[PranavAgarkar07]

Summary

Adds documentation for integrating react-doctor with husky and lint-staged as a pre-commit hook. The --staged mode is already designed for pre-commit workflows — this just shows users how to wire it up.

Closes #203

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Note

Low Risk
Low risk: documentation-only change that doesn’t alter runtime behavior or interfaces.

Overview
Adds a new README section describing how to run react-doctor in a pre-commit hook using Husky + lint-staged, including example commands and a lint-staged config that runs react-doctor --staged --fail-on error --yes to block commits on errors (with notes on stricter warning gating / --json).

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[reactreview]

Note

No issues found

[vercel]

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