Update README.md to English with complete v2.0 documentation

📝 Complete README rewrite:

Content Changes:
- Translated from French to English
- Added version badges (version, python, fastapi, license)
- Detailed all 14 new v2.0 endpoints with examples
- Enhanced API documentation with v2.0 metadata fields
- Added comprehensive usage examples (cURL, Python, JavaScript)
- Added use cases section (surveillance, time-lapse, ML/CV)
- Updated all links to include new docs (CHANGELOG, UPGRADE_v2, VERSION)
- Added GitHub repository links

Structure:
- Quick Start section
- Detailed features breakdown for v2.0
- Complete API endpoint documentation
- Code examples in 3 languages
- Troubleshooting section enhanced
- Professional formatting with emojis

New Sections:
- 🎯 Autofocus Control details
- 📸 Image Capture capabilities
- 🎨 Advanced White Balance with NoIR presets
- 🖼️ Image Processing parameters
- ✨ HDR Support
- 🔍 ROI/Digital Zoom
- 🌓 Day/Night Detection
- 📊 Enhanced Metadata
- 🌟 Use Cases section

All documentation is now consistent with v2.0.0 release.

🚀 Generated with Claude Code (https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

Author: gmathy2104