Bounty: Add Documentation for React.js Frontend (#56)

[elsare7now]

Fixes: #56

Comprehensive documentation for the Kleo Connect React frontend.

What was added

• Full project overview with tech stack table
• Quick start guide (install, env setup, dev, test, build)
• Complete project structure with all directories explained
• Key components table with routes and descriptions
• Dashboard sections documented
• Authentication flow (Particle + Phantom wallet)
• Custom hooks reference (usePhantomWallet, useFetch, useDebounce, useBodyScroll)
• Environment variables table
• Contributing guidelines
• Scripts reference

Acceptance criteria met

• Detailed README with project overview, setup, structure, usage
• Component documentation with inline descriptions
• Build, test, and deploy instructions
• Contributing guidelines