Add demo video to app.py

app.py

@@ -423,6 +423,11 @@ def ask_gpt_python(df_info, key):
 
 
 if __name__ == "__main__":
+    
+    with st.expander("DEMO"):
+        video_url = 'https://user-images.githubusercontent.com/3298308/233874256-469f1a39-e5c9-4add-9251-86ede0258155.mov'
+        st.video(video_url)
+        
     show_examples = docs()
     if show_examples:
         display_example_snippets()