Update README.md

README.md

@@ -45,6 +45,9 @@ torch.cosine_similarity(embeddings[0], embeddings[1], dim=0)
 
 ### Example of Langchain Retriever
 
+RAG with langchain: https://python.langchain.com/v0.1/docs/use_cases/question_answering/
+![image/png](https://cdn-uploads.huggingface.co/production/uploads/6414866f1cbd604c9217c7d0/RrBoHJINfrSWtCNkePs7g.png)
+
 Install the langchain packages
 
 ```bash