docs: improve README with updated usage examples

[williamfds]

Summary

This PR improves the README.md by adding a clear and minimal TypeScript usage example, aligning with the plugin's existing TypeScript support.

What's Changed

• Added a dedicated section for TypeScript usage
• Included a type-safe compression example with reply.compress
• Ensured consistency with the rest of the documentation

Motivation

Many developers using Fastify rely on TypeScript. While the plugin is compatible, the README lacked a direct TypeScript example. This addition makes it easier for TypeScript users to understand how to integrate @fastify/compress effectively.

---

Checklist

• Documentation was updated (README.md)
• Commit message follows the Developer's Certification of Origin
• Run npm run test and npm run benchmark (not applicable to docs-only change)
• Tests and/or benchmarks are included (not applicable)

[jsumners]

What's Changed

• Added complete usage examples for both compression and decompression
• Clarified per-route and global configuration
• Improved formatting and consistency
• Fixed minor typos and outdated content
• Ensured compatibility with TypeScript examples

Motivation

This update provides clearer guidance for new users and better illustrates advanced use cases like inflateIfDeflated, removeContentLengthHeader, and customTypes.

I don't see any of that in this change set. All I see is the addition of a TypeScript example.

[williamfds]

Hi @jsumners

Thanks for the initial review!

I've now updated the PR with:

• A new Usage Highlights section covering advanced features like:
  • inflateIfDeflated
  • removeContentLengthHeader
  • customTypes using both regex and function

Let me know if you think it’s ready or if you'd like any further adjustments.

[mcollina]

lgtm