Add README.md with full documentation

Add empty history.json

Add requirements.txt

Add sample_modelfile.txt - Ollama Modelfile template

Add app.py - Gradio Blocks UI

Add abstract_service.py - orchestration layer

Add history_manager.py - JSON-based history persistence

Add llm_client.py - Ollama API client

Add pdf_utils.py - PDF extraction and cleaning

initial commit