Create 4 pages app design and video to show what is the app about

I want to create 4 page design for any simple idea or even exist one for a mobile app and small video less than 50 seconds describing what is the app about? i have attache the link bellow from google Play store for an existing app with video to get clear idea what i want. [login to view URL] i want very simple and clear and no much work but also understandable .