📝 Add comprehensive README and documentation for Broler

[Copilot]

This PR transforms the minimal 3-line README into a comprehensive, beautiful documentation package that properly showcases Broler - a modern web application for finding broken links within websites.

What's New

🎨 Beautiful README with Complete Documentation

The new README includes:

• Professional header with clear project description and feature highlights
• Visual documentation with actual UI screenshots showing the main interface and settings dialog
• Complete installation guide for both Go backend and Next.js frontend
• Usage examples with step-by-step instructions
• Architecture overview explaining the modern tech stack (Go + gRPC + React + TypeScript)
• Configuration documentation covering all features mentioned in the requirements:
  • URL status checking (reachable/unreachable)
  • JavaScript and CSS file validation
  • Recursive site crawling
  • Domain filtering options
  • URL allow/block lists
  • Optional file type scanning

📸 UI Screenshots

Added high-quality screenshots demonstrating:

• Main interface with URL input, tree view, and real-time progress
• Settings dialog showing all configuration options (domain restrictions, JS/CSS toggles, URL filtering)

📋 Supporting Documentation

• CONTRIBUTING.md: Comprehensive development guidelines including setup instructions, code style guidelines, testing procedures, and PR process
• LICENSE: MIT license for open source compliance
• Updated .gitignore: Proper exclusions for build artifacts, IDE files, and temporary files

Technical Improvements

Project Structure

• Added docs/images/ directory for organized documentation assets
• Cleaned up accidentally committed binary files
• Improved git hygiene with comprehensive .gitignore

Documentation Quality

• All 6 core features clearly documented with examples
• API documentation extracted from gRPC protocol definitions
• Performance notes about concurrent processing and streaming capabilities
• Development setup instructions for both backend and frontend
• Clear architecture explanation of the Go + React stack

This documentation package makes Broler immediately accessible to new users and contributors, providing everything needed to understand, install, and extend the application.

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💡 You can make Copilot smarter by setting up custom instructions, customizing its development environment and configuring Model Context Protocol (MCP) servers. Learn more Copilot coding agent tips in the docs.