adding the sample notebook for knowledge base chat with your doc

Author: debnsuma

.gitignore

@@ -18,4 +18,5 @@ llm-rag-vectordb-python/image-generation-node-js-app/src/frontend/node_modules/*
 searching-from-my-data/.env
 getting-started-with-bedrock/.env
 into-to-rag/rag-wip.ipynb
+kb_chat_with_doc/FAQ_Zappos.com.pdf