Adds support for .cfg files from Valve's source engine in Atom. The most popular of these games being Counter Strike: Global Offensive, Team Fortress 2, and Left 4 Dead 2, probably.
apm install language-source-cfg
... or install through the Atom GUI.
MIT. See the LICENSE
file.
Good catch. Let us know what about this package looks wrong to you, and we'll investigate right away.