docs: Migrate wiki to GitHub documentation - Bounty #85

[MiloChiang]

Summary

This PR addresses bounty #85 by migrating the wiki site to comprehensive GitHub documentation.

Changes Made

• README.md: Project overview, features, quick start guide
• docs/API.md: RPC endpoint reference with usage examples
• CONTRIBUTING.md: Development setup and contribution guidelines

Documentation Structure

├── README.md
├── CONTRIBUTING.md
└── docs/
    └── API.md

Quality Checklist

• Clear project overview
• Installation instructions
• API reference with examples
• Contributing guidelines
• Proper Markdown formatting

Bounty

Resolves #85

cc: @maintainer