Update README.md

Merge pull request #2 from JingliCheng/rag

final experiments

new 10 examples for gpt4-mini

ran experiment 40

VectorDB and experiment

Update workflow_autogen.py

add wrong answer placeholder for refine.py

Update rank.py

Update chunk_and_retrieve.py

Update chunk_and_retrieve.py

Merge branch 'jingli-dev' of https://github.com/JingliCheng/NQ_multi_agent into jingli-dev

update concurrency

Update rank.py

update rank