Explore and open files in the current project.
Press ctrl-\ or cmd-\ to open/close the Tree view and alt-\ or ctrl-0 to focus it.
When the Tree view has focus you can press a, shift-a, m, or delete to add, move or delete files and folders.
The Tree View displays icons next to files. These icons are customizable by installing a package that provides an atom.file-icons service.
The atom.file-icons service must provide the following methods:
iconClassForPath(path)- Returns a CSS class name to add to the file view