Update README.md

Update README.md

Enhanced cleanup procedures and adjusted permissions for improved student access, allowing the creation and reading of Delta tables within a pre-existing catalog and schema without requiring 'create catalog' permissions.

Replace OpenAI integration with Llama70B Chat

added UC logging for Langchain

added unity catalog model tracking

added intro and prompt engineering notebooks

added preliminary code for RAG workshop.

Delete 02-RAG/images/llm-genai-workshop-dataprep1.png

adding images used in the PoC notebook

Initial commit