This folder will contain the customer's front end files, it can not be tracked in the github. So the default is empty.
If you set the props use_custom_webapp=true, that means you will use your own design of the frontend web page.
Then you MUST copy all the files from the folder OBP-API/obp-api/src/main/webapp to here, and customize the HTML, CSS,
or JS files as your requirements.