Since we are talking about a rolling credits screen in an app, you may also want to include a touch event listener where the user can manually stop and scroll the credits as they see fit. Then, if the user lets go, simply resume the scroll again.
1. Create a display.newGroup() and position it off the bottom of the screen or where you want the credits to start.
2. Create display.newText() objects for each line of your scrolling credits and insert it into the group, positioning accordingly.
3. Add a transition.to() that moves the display.newGroup() up the screen. You can use an onComplete function to handle whatever you want to do when the credits finish.
4. Optionally use a graphics.newMask() to make it so it doesn't have to start at the very bottom of the screen. You might be able to have some grays in the mask to provide a fadeIn/fadeOut at the top and bottom as the display group moves under the mask.