electron/docs/tutorial/application-distribution.md

Application distribution

To distribute your app with atom-shell, you should name the folder of your app as app, and put it under atom-shell's resources directory (on OS X it is Atom.app/Contents/Resources/, and on Linux and Windows it is resources/), like this:

On Mac OS X:

atom-shell/Atom.app/Contents/Resources/app/
├── package.json
├── main.js
└── index.html

On Windows and Linux:

atom-shell/resources/app
├── package.json
├── main.js
└── index.html

Then execute Atom.app (or atom on Linux, and atom.exe on Windows), and atom-shell will start as your app. The atom-shell directory would then be your distribution that should be delivered to final users.

Build with grunt

If you build your application with grunt there is a grunt task that can download atom-shell for your current platform automatically: grunt-download-atom-shell.