Add comprehensive professional documentation to README.md with architecture diagrams, installation guides, and extensive troubleshooting

[Copilot]

Overview

This PR transforms the README.md from basic documentation (96 lines) into a comprehensive, professional guide (2,486 lines) that provides complete coverage of the MKV Batch Remuxer project for users of all technical levels.

What Changed

The README.md has been completely rewritten to include:

📖 Documentation Structure

• Professional badges for license, Python version, and platform support
• Comprehensive table of contents with 16 linked sections for easy navigation
• 20 major sections covering all aspects of the project from installation to advanced usage

🏗️ Architecture & Design

• 3 ASCII diagrams illustrating:
  • High-level system architecture with component layers
  • Component interaction flow and data processing pipeline
  • Threading model for GUI concurrent processing
• Complete folder structure with detailed file descriptions
• Track selection logic visualization showing how language filtering works

📥 Installation & Setup

• Platform-specific installation guides:
  • Windows (PowerShell commands)
  • macOS (Homebrew and manual installation)
  • Linux Ubuntu/Debian (apt-based)
  • Linux Fedora/RHEL (dnf-based)
• Prerequisites section with system requirements and verification commands
• Post-installation verification steps and troubleshooting

📚 Usage Documentation

• GUI walkthrough: 6-step process with visual representations and tips
• CLI prompts guide: All 8 interactive prompts explained in detail
• Common usage patterns for typical scenarios
• Best practices for both interfaces

🌍 Language Reference

• ISO 639-2 language codes table with 50+ languages
• Alternative codes explained (e.g., deu/ger for German)
• Special codes documented (und, mul, zxx)
• Usage examples for different language selection scenarios

💡 Practical Examples

Five real-world scenarios with complete step-by-step instructions:

1. Anime Collection - Keeping Japanese audio + English subtitles
2. International Movie Library - Multi-language family requirements
3. Video Archive Testing - Dry-run workflow for large batches
4. Resumable Processing - Handling interruptions gracefully
5. Corporate Standardization - Professional video library management

Each example includes expected results, space savings, and processing time estimates.

🔧 Troubleshooting

18 common issues with detailed solutions:

• Installation problems (mkvmerge not found, Python issues, tkinter missing)
• Permission errors and file access issues
• Processing problems (slow performance, failed files, wrong tracks)
• GUI/CLI specific issues
• Output validation and quality checks
• Platform-specific troubleshooting

❓ FAQ Section

24 questions and answers organized by category:

• General questions about remuxing and quality
• Technical questions about dependencies and compatibility
• Usage questions about language selection and automation
• Error handling and recovery
• Performance optimization
• Safety and data protection

🤝 Community & Support

• Contributing guidelines and development setup
• License information (MIT)
• Support channels and issue reporting guidelines
• Acknowledgments and related resources
• Links to external documentation and tools

Impact

Before

• Basic README with minimal information
• Limited troubleshooting guidance
• No architecture documentation
• Simple feature bullet points
• Generic installation steps

After

• Professional comprehensive documentation
• 18 troubleshooting scenarios with solutions
• 3 architecture diagrams showing system design
• Detailed feature breakdown (85+ features documented)
• Platform-specific installation for Windows, macOS, and Linux
• 5 practical real-world examples
• Complete language code reference
• 24 FAQ entries covering all aspects

Validation

All documentation has been validated:

• ✅ 97 code blocks properly closed
• ✅ No markdown syntax errors
• ✅ All internal links validated
• ✅ Consistent formatting throughout
• ✅ Professional tone and structure

Files Changed

• README.md: +2,471 lines, -80 lines (net +2,391 lines)

This comprehensive documentation update makes the MKV Batch Remuxer project more accessible, easier to understand, and provides users with all the information they need to successfully install, configure, and use the application.

Original prompt

Update README.md with complete professional documentation including project overview, objectives, detailed features for GUI and CLI, system architecture with diagrams, complete folder structure explanation, step-by-step installation instructions for Windows/macOS/Linux, comprehensive usage guides with examples, ISO 639-2 language codes reference table, workflow and data flow diagrams, extensive troubleshooting section with 15+ common issues and solutions, and 5 practical usage examples.

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