You can add a font to theme/font and then add it to your configuration in custom-variable.scss like this:
@font-face {
font-family: "icons-blank-theme";
font-style: normal;
font-weight: normal;
src: url("/fonts/Blank-Theme-Icons.eot?#iefix") format("embedded-opentype"), url("/fonts/Blank-Theme-Icons.woff") format("woff"), url("/fonts/Blank-Theme-Icons.ttf") format("truetype"), url("/fonts/Blank-Theme-Icons.svg#icons-blank-theme") format("svg");
}
@font-face {
font-family: "icons-blank-theme";
font-style: normal;
font-weight: normal;
src: url("/fonts/Blank-Theme-Icons.eot?#iefix") format("embedded-opentype"), url("/fonts/Blank-Theme-Icons.woff") format("woff"), url("/fonts/Blank-Theme-Icons.ttf") format("truetype"), url("/fonts/Blank-Theme-Icons.svg#icons-blank-theme") format("svg");
}