Update README.md

README.md

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----
-title: Rag Document Qa
-emoji: 📉
-colorFrom: purple
-colorTo: yellow
-sdk: gradio
-sdk_version: 6.15.2
-python_version: '3.13'
-app_file: app.py
-pinned: false
-short_description: RAG-based Document Q&A chatbot — upload any PDF and ask ques
----
+# RAG Document Q&A Chatbot
 
-Check out the configuration reference at https://huggingface.co/docs/hub/spaces-config-reference
+Upload any PDF and ask natural language questions about it.
+
+## Stack
+- LangChain + FAISS for retrieval
+- HuggingFace MiniLM embeddings
+- Groq LLM (LLaMA 3.3 70B)
+- Gradio UI
+
+## Setup
+Add your `GROQ_API_KEY` in Space Secrets.