This PR adds support for Google's Gemini API alongside the existing OpenAI GPT implementation, with special focus on Japanese language support.

Added features:

• Support for Google Gemini Pro API
• Japanese language support for PDF analysis
• Separate scripts for English and Japanese processing
• Updated documentation in both English and Japanese

New files:

• pdf_reader_gemini.py: English version using Gemini API
• pdf_reader_gemini_ja.py: Japanese optimized version using Gemini API
• README_ja.md: Japanese documentation
• .env.example: Updated with Gemini API key example

Changes:

• Added new dependencies in requirements.txt
• Updated main README with Gemini API information
• Added documentation about API choice considerations

Benefits of this addition:

1. Alternative AI model choice for users
2. Better Japanese text processing capabilities
3. Cost-effective option compared to OpenAI GPT
4. Improved documentation for Japanese users

Testing:

The implementation has been tested with both English and Japanese PDFs, confirming:

• Proper text extraction
• Accurate analysis and summarization
• Correct handling of Japanese characters
• Proper JSON output encoding

Setup required:

Users need to:

1. Install new dependencies (google-generativeai)
2. Set up Gemini API key in .env
3. Choose appropriate script based on language needs