Got a great idea for an app or game? It's easier than you think to get started. Australia’s Charles Sturt University will soon kick off its next open online course. Learn to write/release apps across iOS, Android and Windows via five weeks of after-hours webinars and 12 hours of structured work. By the end, you’ll be able to build your own app and earn a certificate after passing the final exam. Join 2,400 students who've already registered free. Here’s what you need to know.