Update README.md

README.md

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 short_description: RAG System with Phi-2
 ---
 
-Check out the configuration reference at https://huggingface.co/docs/hub/spaces-config-reference
+# PDF RAG System with Phi-2
+
+This application allows you to upload PDF documents and ask questions about their content. It uses a Retrieval-Augmented Generation (RAG) pipeline with the Phi-2 language model.
+
+## Features
+
+- PDF document upload and processing
+- Text and table extraction from PDFs
+- Hybrid search combining vector embeddings and BM25
+- Query expansion for better search results
+- Streaming response generation
+
+## How to Use
+
+1. Upload your PDF files
+2. Process the documents
+3. Ask questions about the content
+4. Adjust retrieval and generation parameters as needed
+
+## Technical Details
+
+- Uses Phi-2 language model via llama.cpp
+- Sentence Transformers for document embeddings
+- FAISS for vector search
+- BM25 for keyword search
+- Hybrid retrieval with configurable weighting