we use google fonts,
in the atlas sass configeration you can specify what font you want.
I havnt added a local font but i think it would work the same
$font-family-import: "https://fonts.googleapis.com/css?family=Open+Sans:300,400,400i,600,700,800";
$font-family-brand: 'Open Sans', sans-serif;
$font-family-base: 'Open Sans', sans-serif;