Added README.md for HF

README.md

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+---
+title: Example Chainlit Langchain RAG
+emoji: 🧩
+colorFrom: blue
+colorTo: green
+sdk: docker
+#sdk_version: "3.0"
+app_file: app.py
+pinned: false
+---
+
+# Example Chainlit Langchain RAG
+
+This is an example project demonstrating the use of Chainlit and Langchain for retrieval-augmented generation (RAG).