added export button for player frequency

app.py

@@ -532,3 +532,10 @@ with tab2:
                 # Display the table
                 st.write("Player Frequency Table:")
                 st.dataframe(summary_df.style.format({'Percentage': '{:.2f}%'}), height=500, use_container_width=True)
+            
+            st.download_button(
+                label="Export player frequency",
+                data=convert_df(summary_df),
+                file_name='NBA_player_frequency.csv',
+                mime='text/csv',
+            )