add Dockerfile, Readme.md

Dockerfile

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+# Base image
+FROM python:3.10-slim
+
+# Set working directory
+WORKDIR /app
+
+# Copy files
+COPY . .
+
+# Install dependencies
+RUN pip install --no-cache-dir -r requirements.txt
+
+# Expose port (HF expects 7860 but FastAPI can use it too)
+EXPOSE 7860
+
+# Start FastAPI with uvicorn
+CMD ["uvicorn", "main:app", "--host", "0.0.0.0", "--port", "7860"]

Readme.md

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+---
+title: RAG Chatbot Backend
+emoji: 🤖
+colorFrom: blue
+colorTo: purple
+sdk: docker
+pinned: false
+---
+
+# RAG Chatbot Backend
+
+This is the FastAPI backend for my RAG chatbot.  
+It processes PDFs, stores embeddings in Pinecone, and answers queries using Groq + Gemini.