Add comprehensive README documentation for letshare project

[Copilot]

This PR addresses the request to write comprehensive documentation for the letshare project after thoroughly analyzing the codebase.

Changes Made

• Replaced minimal README with a detailed 220-line documentation covering all aspects of the project
• Added project overview with clear description of letshare as a TUI file-sharing application
• Included installation instructions for both source builds and Go install methods
• Documented all key features including mDNS discovery, file sharing, progress tracking, and configuration
• Added usage guide with keyboard shortcuts and step-by-step instructions
• Provided configuration documentation with TOML examples for all settings
• Included architecture overview explaining the modular design and key components
• Added development information with build instructions and project structure
• Included contributing guidelines and licensing information

Understanding Demonstrated

The README was written after comprehensive code analysis covering:

• Main application flow: TUI initialization with Bubble Tea framework
• Core components: mDNS service discovery, HTTP server/client, ZIP compression
• Configuration system: TOML-based settings for personal, sharing, and download preferences
• File operations: Directory navigation, file selection, archive creation with progress tracking
• Network architecture: Local Wi-Fi discovery and HTTP-based file transfer
• Dependencies: Modern Go libraries including Bubble Tea, Lipgloss, zeroconf, and others

Result

Users now have complete documentation to:

• Understand what letshare does and how it works
• Install and configure the application
• Use all features effectively with keyboard shortcuts
• Contribute to development with clear project structure
• Customize settings for their specific needs

The documentation maintains the project's existing "Under Development" status while providing professional-grade documentation quality.

Warning

Firewall rules blocked me from connecting to one or more addresses

I tried to connect to the following addresses, but was blocked by firewall rules:

• 224.0.0.251

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to my firewall allow list

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[Copilot]

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