Improve README with Structure, Setup Guide, and Contribution Instructions

[shrutikabhavar]

What to Improve

• Add Table of Contents
• Add About, Installation, Usage, Tech Stack, and Contributing sections
• Format text with headings (##) and lists (-)
• Fix small grammar errors (like "governace" → "governance")
• Add link to LICENSE at the end

Make the README clean, easy to read, and helpful for new users or contributors