Update ToDo.md

ToDo.md

@@ -366,9 +366,18 @@ st.latex(r''' a+a r^1+a r^2+a r^3 ''')
 
 - Show the complete history of questions and answers:
 
-  - Gewoon chat venster met weergave van complete chat history in de actuele sessie: reeds gedaan
+  - Gewoon chat venster met weergave van complete chat history in de actuele sessie: DONE
   - ToDo: save session chat history from user + AI in a messages list (and persistently save them !)
 
+Done (persistence not yet done !):
+
+    # Show total messages history of user + AI in this session up till this point
+    with st.expander("Show total messages history of user + AI in this session up till this point"):
+        # st.session_state.messages
+        st.write(st.session_state.messages)
+        st.write("--------------------------------")
+
+
 ...