WP-FontAwesome adds Font Awesome to WordPress from Composer.
The main reason for this is to help with dependencies. Instead of having Font Awesome bundled in both a theme and composer module this allows both to require a single module which by registering the styles/scripts itself means no overlap between multiple installs.
composer require ed-itsolutions/wp-fontawesome
//functions.php, in your wp_enqeue_scripts action:
wp_enqueue_script('font-awesome');