Update frontend/README.md

Signed-off-by: Song Luar <[email protected]>
Signed-off-by: luarss <[email protected]>

Author: luarss

frontend/README.md

@@ -12,7 +12,7 @@ CHAT_ENDPOINT=<your-chat-endpoint> Defaults to http://localhost:8000/chatApp
 
 ## For Feedback Evaluation (Optional)
 
-TODO!
+For this section, please refer to the [mongodb](./mongoDB.md) documentation for more details. 
 
 ## Running the Application