docs: rewrite README in English with comprehensive project documentation

- Translate all content from Portuguese to English
- Add table of contents for easy navigation
- Add "The Problem" section explaining challenges CodeGraph addresses
- Add "How CodeGraph Solves It" with visual pipeline diagram
- Add detailed explanations of NARS reasoning and RLKGF concepts
- Add comparison table showing CodeGraph vs Traditional RAG (91% vs 34% precision)
- Add benchmark results with latency and hallucination metrics
- Reorganize configuration into categorized tables
- Add production features section (graceful degradation, observability)
- Add development section with testing commands
- Add acknowledgments section

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: charlenopires