Create comprehensive and professional README documentation

[Copilot]

This PR completely rewrites the README.md to provide comprehensive, professional documentation for the MagicPacket project. The original README contained only a single sentence describing the project, which was insufficient for users to understand and effectively use the application.

Key Improvements

📋 Structure & Content

• Professional project description highlighting the unique DNS TXT record approach
• Comprehensive features section with visual indicators
• Detailed "How It Works" section explaining the innovative DNS-based configuration system
• Complete installation instructions for both Docker and direct .NET execution
• Extensive usage examples and configuration options

🐳 Docker & Deployment Focus

• Docker-first approach with multiple deployment examples
• Docker Compose configuration samples
• Environment variable documentation
• Container usage patterns and best practices

🔧 Configuration & Setup

• DNS TXT record setup examples for multiple providers (Bind9, PowerDNS, Cloudflare)
• Parameter format specifications
• Environment variable reference table
• Network configuration considerations

📚 User Experience

• Step-by-step usage examples
• Troubleshooting section with common issues and solutions
• Debug commands and network diagnostics
• Contributing guidelines and development setup

🎯 Professional Polish

• Consistent markdown formatting
• Code syntax highlighting
• Organized sections with clear hierarchy
• Visual elements (emojis, tables, code blocks)

The README now serves as a complete guide that enables users to:

• Understand the project's unique value proposition
• Install and configure the application correctly
• Set up DNS TXT records across different providers
• Troubleshoot common issues
• Contribute to the project

This transforms the project from having minimal documentation to having enterprise-grade documentation suitable for production deployments.

Fixes #9.

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[Copilot]

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