added thinking spinner

app.py

@@ -94,7 +94,8 @@ def launch_bot():
     if st.session_state.messages[-1]["role"] != "assistant":
         with st.chat_message("assistant", avatar='🤖'):
             stream = generate_response(prompt, cfg) 
-            response = st.write_stream(stream) 
+            with st.spinner('Thinking...'):
+                response = st.write_stream(stream) 
             message = {"role": "assistant", "content": response, "avatar": '🤖'}
             st.session_state.messages.append(message)