Update QnA.py

QnA.py

@@ -2,6 +2,7 @@ from langchain.chains.combine_documents import create_stuff_documents_chain
 from langchain_core.prompts import ChatPromptTemplate
 from langchain.chains import create_retrieval_chain
 from langchain.chains.summarize.chain import load_summarize_chain
+from langchain_community.llms.huggingface_hub import HuggingFaceHub
 
 #from Api_Key import google_plam
 from langchain_groq import ChatGroq