Improve README with Local Setup and Contribution Guide

[Sahildavkhar]

This PR enhances the main README.md file by adding clear local setup instructions, WordPress backend connection steps, and links to documentation for contributors. It improves developer onboarding and helps new contributors quickly get started with SnapWP.

Changes Made
Added installation and local development steps (npm install, npm run dev).
Included setup instructions for connecting to WPGraphQL.
Improved readability and section formatting with emojis and tables.
Added a detailed “Development & Contributing” section.
Clarified available SnapWP packages and their roles.
Included final contribution steps for committing and opening PRs.

Testing
Verified that the local development setup runs successfully with:
npm install
npm run dev

Ensured all package links and internal docs references work correctly.

Here’s a quick preview of the improved structure:
Local setup guide 🧑‍💻
WordPress integration instructions 🔗
Package overview table 📦
Contribution guide 🧩
Community & hiring section 💬

Acknowledgements
Special thanks to the rtCamp team for open-sourcing SnapWP and maintaining a clean modular structure that makes contribution easy.

PR Type
Documentation improvement

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Latest commit: 3989bce

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