To Install the atom editor for Linux (taken from here):

$ sudo add-apt-repository ppa:webupd8team/atom
$ sudo apt-get update
$ sudo apt-get install atom

I needed syntax highlighting for Lua. My suggestion is:

• Start atom, press <Ctrl><Shift>P
• Type: install packages
• Select ‘Settings View: Install Packages’
• Search for language-lua package

• install the language-lua package

You should get the syntax highlighting + other goodies explained here