Add English translation of appendix-g.md (References and Citations)

[Copilot]

This PR adds the complete English translation of appendix-g.md (References and Citations) to the website.en/MarkDown/ directory.

Changes Made

• Created website.en/MarkDown/appendix-g.md: Complete English translation of the Japanese bibliography and references appendix
• Language: All content translated to American English with proper spelling conventions (color, organization, analyze)
• Structure: Preserved all markdown formatting, headings, lists, and links
• Images: Updated image references to point to ../Images/ (website.en/Images/) maintaining the same file names
• Content: Comprehensive translation covering:
  • Author's presentations and technical conference materials
  • Programming principles and design books
  • Test-driven development and quality management resources
  • Technical concepts and terminology sources
  • Programming language and technology references
  • Learning resources and community information
  • Recommended reading list
  • Acknowledgments

Technical Details

• File size: 257 lines, 10,344 characters
• Encoding: UTF-8 without BOM
• Validation: Website functionality tested and confirmed working
• Image accessibility: Both banner-appendix-g.svg and app_g.biblio_map.png confirmed accessible
• Translation completeness: No Japanese text remains except appropriate contextual references (e.g., "Japanese Programming Communities")

The translated appendix maintains the same comprehensive structure as the original, providing English readers with complete access to the bibliography, references, and citations that support the programming best practices and principles covered throughout the book.

Fixes #203.

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[Copilot]

Pull Request Overview

This PR adds the English translation of the References and Citations appendix to the international website. The translation comprehensively covers all bibliographic and reference materials that support the programming best practices and principles discussed throughout the book.

• Complete English translation of appendix-g.md with 257 lines covering primary references, technical concepts, and learning resources
• Proper localization using American English spelling conventions and updated image path references
• Comprehensive bibliography including author's presentations, programming books, technical communities, and recommended reading