Create the DTMF webhook

Create the /webhooks/dtmf route by entering the following code beneath your /webhooks/answer route:

This code examines the request to see which digit the user entered (in req.body.dtmf) and adds the appropriate action to the existing NCCO. If the user presses 1, it adds a talk action to read out the current date and time. If the user presses 2, it plays an audio file into the call using a stream action. If the user presses any other key, it is ignored and the function returns the original NCCO with the initial menu choices you defined in the mainMenu function.