(#2719) - add video tutorial link

I made a silly video tutorial for the "Get Started" guide. Somebody actually did ask me to do this on IRC, because they were having trouble with the written tutorial.

I include my ugly mug in the lower-right hand corner not out of narcissism, but because I just find it really boring when screencasts don't have someone's face. It's the same reason all those Twitch videos also include a player cam.