Update README.md

Author: fm1320

README.md

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 ## langchain-superlinked
+<img width="640" height="400" alt="image" src="https://github.com/user-attachments/assets/f2435f45-403d-4e82-9237-faebe9746a06" />
+
 
 Integration package that exposes Superlinked retrieval capabilities via the standard LangChain retriever interface. It lets you plug a Superlinked-powered retriever into LangChain RAG pipelines while keeping your vector storage and schema choices flexible.
 If you want to dive deeper into how Superlinked's mixture-of-encoders algorithm is different, [learn more here](https://links.superlinked.com/get_demo_langchain).