How to add Terms of Use acceptance in my App?

The Teach on Mars solution comes up with an optional Terms of Use acceptance functionality.

• Guest mode (limited access without login): learners are invited to accept the Terms of Use once they start the application. They must check the acceptance box to be brought to the application home page.
• Authenticated mode (full access with id and password):
• Learners know their connexion IDs: they enter their IDs and are brought to the Terms of Use pop up before they can proceed further
• Learners self create their connexion IDs: they must accept the Terms of Use before they can create their ID and password.

In both cases, the Terms of Use are presented each time learners connect on a new device and after learners have previously disconnected from the application.