atom-shell example app

This is an example atom-shell app based off these instructions:

• https://github.com/atom/atom-shell/blob/master/docs/tutorial/quick-start.md

To run you should be able to do the following:

./run.sh

OR on Windows:

run

OR manually:

Install grunt if you haven't already

npm install -g grunt-cli

Then run the following to download version 0.12.2 of atom-shell

cd ./build
npm install
grunt download-atom-shell

Then you should be able to run the app:

./build/atom-shell/Atom.app/Contents/MacOS/Atom ./hello-app

OR on Windows:

./build/atom-shell/atom ./hello-app