add spinner waiting for summary

app.py

@@ -250,8 +250,9 @@ if st.session_state['count_checked'] > 0:
                 products.append(
                     st.session_state['metadata'][pid].get('document')
                 )
-            summary = summarize_products(products)
-            st.markdown(summary.get("content"), unsafe_allow_html=True)
+            with st.spinner('Summarizing...'):
+                summary = summarize_products(products)
+                st.markdown(summary.get("content"), unsafe_allow_html=True)
 else:
     try:
         summary_container.empty()