Zero set-up?
At the end of the film Captain America and Black Widow are running The Avengers(The Replacement for Shield). Captain America is also now the main authority figure. Which is why him being the main character of Civil War now makes sense. After The Hulk goes on his rampage, it's stated that the governments of the world aren't happy with them. It set it up fine and actually made sense within the main story of the film.
What does any of that have to do with Captain America and Iron Man having beef? Just because they introduced the B-scrub division of the Avengers doesn't imply any about Civil War.
All it says is, oh...these are the b-scrub Avengers nothing more.