Following the install instructions only partially works. You do get the Templates loaded but there are essentially ZERO instructions on how to use the Templates.
So after you have FontAwesome installed, add the following to your Common.css at the very top
@import "/<YOUR MW DIRECTORY>/extensions/FontAwesome/res/fontawesome/css/all.min.css";
And then all of the instructions on the FontAwesome pages will work and you can use the standard syntax like