This is a package for the Atom text editor that provides syntax highlighting for Runway specifications. Runway is a tool for modeling concurrent and distributed systems as state machines. This package is also used by runway-browser to apply syntax highlighting to Runway models being viewed in a web browser.
To install, use apm link to create a symlink into ~/.atom/packages:
git clone https://github.com/salesforce/language-runway.git
cd language-runway
apm link
Then restart Atom.
If you're looking for syntax highlighting of Runway models for the Vim text editor, that's available in the runway-compiler repo.