Update app.py

app.py

@@ -1,6 +1,7 @@
 import streamlit as st
 import os
 import pickle
+from streamlit_extras.add_vertical_space import add_vertical_space
 from huggingface_hub import Repository
 from PyPDF2 import PdfReader
 from langchain.text_splitter import RecursiveCharacterTextSplitter