Add multilingual documentation support

[JeremyDev87]

Add Multilingual Documentation Support

Summary

This PR adds comprehensive multilingual documentation support for Codingbuddy, making the project accessible to a global audience. Documentation is now available in 5 languages: English (existing), Korean, Chinese (Simplified), Japanese, and Spanish.

Changes

New Multilingual README Files

Added 4 new README files with complete translations:

• README.ko.md - Korean (한국어)
• README.zh-CN.md - Chinese Simplified (中文)
• README.ja.md - Japanese (日本語)
• README.es.md - Spanish (Español)

Each README includes:

• Project overview and value proposition
• Quick start guide
• Supported AI tools overview
• Documentation index
• Architecture overview

Complete Documentation Translations

Added translated versions of all core documentation files for each language:

Getting Started Guides

• docs/ko/getting-started.md (219 lines)
• docs/zh-CN/getting-started.md (219 lines)
• docs/ja/getting-started.md (219 lines)
• docs/es/getting-started.md (219 lines)

Philosophy Documents

• docs/ko/philosophy.md (136 lines)
• docs/zh-CN/philosophy.md (136 lines)
• docs/ja/philosophy.md (136 lines)
• docs/es/philosophy.md (136 lines)

Supported Tools Guides

• docs/ko/supported-tools.md (238 lines)
• docs/zh-CN/supported-tools.md (238 lines)
• docs/ja/supported-tools.md (238 lines)
• docs/es/supported-tools.md (238 lines)

Language Navigation

Added language switcher links to all documentation pages:

• README.md - Added language selector at the top
• docs/getting-started.md - Added language navigation
• docs/philosophy.md - Added language navigation
• docs/supported-tools.md - Added language navigation

Each translated document includes navigation links to switch between all available languages.

Minor Improvements

• docs/keyword-invocation.md - Added blank line for better formatting

Statistics

• 21 files changed
• 2,793 insertions, 0 deletions
• 17 new files added (4 READMEs + 12 documentation files)
• 4 files updated (language navigation added)

Language Coverage

Language	Code	README	Getting Started	Philosophy	Supported Tools
English	en	✅	✅	✅	✅
Korean	ko	✅	✅	✅	✅
Chinese (Simplified)	zh-CN	✅	✅	✅	✅
Japanese	ja	✅	✅	✅	✅
Spanish	es	✅	✅	✅	✅

Related Issue

Closes #66

Documentation Structure

The multilingual documentation follows a consistent structure:

README.md (English)
├── README.ko.md (Korean)
├── README.zh-CN.md (Chinese)
├── README.ja.md (Japanese)
└── README.es.md (Spanish)

docs/
├── getting-started.md (English)
├── philosophy.md (English)
├── supported-tools.md (English)
├── ko/
│   ├── getting-started.md
│   ├── philosophy.md
│   └── supported-tools.md
├── zh-CN/
│   ├── getting-started.md
│   ├── philosophy.md
│   └── supported-tools.md
├── ja/
│   ├── getting-started.md
│   ├── philosophy.md
│   └── supported-tools.md
└── es/
    ├── getting-started.md
    ├── philosophy.md
    └── supported-tools.md

Key Features

• ✅ Complete translations for all core documentation
• ✅ Consistent navigation across all languages
• ✅ Language switcher on every page
• ✅ Maintained original English as the source of truth
• ✅ Proper language codes and naming conventions
• ✅ All code examples and technical content preserved

Translation Quality

All translations maintain:

• Technical accuracy
• Consistent terminology
• Proper formatting and code blocks
• Navigation links
• Code examples (preserved from English)

Testing

• All markdown files render correctly
• Language switcher links work properly
• Code examples are preserved in all languages
• Navigation structure is consistent
• No broken internal links

Screenshots

N/A - Documentation only change

Notes

This PR significantly improves the accessibility of Codingbuddy for non-English speaking developers. The multilingual support enables:

• Broader adoption - Developers can use Codingbuddy in their native language
• Better understanding - Complex concepts are easier to grasp in one's native language
• Community growth - Lowers barriers to entry for international contributors

The documentation structure is designed to be easily extensible for additional languages in the future.