Update README.md with comprehensive professional documentation

[Copilot]

Transformed the basic 3-line README.md into a comprehensive, professional documentation that properly represents the MagicPacket project.

Changes Made

Before: Simple description with minimal information

# MagicPacket

A tiny CLI utility made with .NET 8, that is intended to be run manually via a Docker container. The CLI will ping a pre-configured PC and send a Magic Packet (Wake-on-LAN, essentially) to wake up a PC from sleep.

After: Complete professional documentation with:

• Project badges for .NET 8, Docker support, and licensing
• Clear project description explaining the Wake-on-LAN functionality
• Comprehensive features list with emojis and detailed capabilities
• Installation instructions for both Docker and manual setup
• Configuration documentation including DNS TXT record format examples
• Usage examples covering Docker, Docker Compose, and Kubernetes deployments
• Technical details about the Magic Packet protocol implementation
• Troubleshooting section for common issues and debugging
• Development and contributing guidelines
• Proper markdown formatting with sections, code blocks, and examples

Key Improvements

1. Professional presentation with badges and structured sections
2. Comprehensive setup instructions for different deployment scenarios
3. Clear configuration examples showing DNS TXT record format
4. Multiple usage patterns including automation and scheduling
5. Technical explanations of the Wake-on-LAN protocol
6. Troubleshooting guidance for common deployment issues
7. Development-friendly documentation for contributors

The updated README now serves as a complete reference guide that makes the project accessible to both end users and developers, while maintaining professional standards expected in open-source projects.

Fixes #11.

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