One way to add_action ooo style

EnqueueScripts.php

<?php
namespace IngredientManager;

/**
 * Usage: In calling script:
 * $enqueue_scripts = new EnqueueScript
 */

class EnqueueScript
{
    public function __construct()
    {
        add_action('wp_enqueue_scripts', array($this, 'enqueue_scripts'));
    }

    /**
     * Enqueue scripts & styles
     *
     * @return bool
     */
    public function enqueue_scripts()
    {
        // *_version updates version # whenever file is updated to help with caching issues
        $js_version  = date("ymd-Gis", filemtime(plugin_dir_path(dirname(__FILE__)) . 'Resources/js/scripts.js'));
        $css_version = date("ymd-Gis", filemtime(plugin_dir_path(dirname(__FILE__)) . 'Resources/css/styles.css'));

        wp_enqueue_script('scripts', plugin_dir_url(dirname(__FILE__)) . 'Resources/js/scripts.js', array('jquery'), $js_version);
        wp_enqueue_style('styles', plugin_dir_url(dirname(__FILE__)) . 'Resources/css/styles.css', false, $css_version);

        wp_enqueue_script('font-awesome', 'https://use.fontawesome.com/206ac00799.js');

        return true;
    }
}