Update app.py

app.py

@@ -26,6 +26,8 @@ elif st.session_state.selected_page == 'NLP Lifecycle':
     st.title('Natural Language Processing (NLP) Lifecycle')
 elif st.session_state.selected_page == 'NLP Techniques':
     st.title('Techniques in Natural Language Processing (NLP)')
+elif st.session_state.selected_page == 'Problem Definition':
+    st.title('Steps in the Natural Language Processing (NLP) lifecycle:')
     
 # Content for "What is NLP?"
 if st.session_state.selected_page == 'What is NLP?':