It’s a play along, and a great one at that. Thank you for putting this together!! IMHO, there really isn’t a fixed strumming pattern for this song. If you listen carefully to the original you begin to feel the flow of the song. There are several places a single strum per bar can have a nice effect.
Dude strumming pattern is so easy, just listen to the song and you will get it, this is one song you will never forget. Here is the strumming pattern. --> Down (D) | Down (D) | Up (U) | Down (D) | Up (U) contine this through each chord change.