docs: bring README to js-ajv parity

[alltheseas]

Summary

Full README rewrite: badges, dotnet install, overview, Quick Start, full API reference with parameter tables, record type docs, usage examples, Known Limitations (notes missing ValidateNip11 and ValidateMessage), Related Packages.

Test plan

• Verify markdown renders correctly on GitHub

🤖 Generated with Claude Code

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: fbebd6a0-4ee1-426c-a6c9-4d195b07e73a

📥 Commits

Reviewing files that changed from the base of the PR and between 211de9e and 7eb0e3e.

📒 Files selected for processing (1)

• README.md

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch docs/readme-parity

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