Add download button for contest info in app.py

- Introduced a download button that allows users to export contest information as a CSV file, enhancing data accessibility and user experience.

app.py

@@ -439,6 +439,7 @@ with tab2:
             use_container_width=True,
             hide_index=True
         )
+        st.download_button(label="Download Contest Info", data=st.session_state['display_contest_info'].to_csv(index=False), file_name="contest_info.csv", mime="text/csv")
     else:
         st.stop()