I'm developing a Scala application in IntelliJ Idea 12. I have sbt plugin for Idea installed (Setting -> Plugins -> Browse repositories ...). Now I want to use some extra libraries for Scala, let's say one of them is https://github.com/stevej/scala-json. So I downloaded zip file from its source code from its github repository.
What do I do next? What is the standard way of adding a third-party library to Scala project using Intelli Idea 12 with SBT plugin installed?