Update app.py

app.py

@@ -1,4 +1,10 @@
 import streamlit as st
 
+st.title('Question-Answering NLU')
+
+st.sidebar.title('Navigation')
+menu = st.sidebar.radio("", options=["Introduction", "Parsing NLU data into SQuAD 2.0", "Generating Questions", "Training",
+                                     "Evaluation"], index=0)
+
 x = st.slider('Select a value')
 st.write(x, 'squared is', x * x)