Simple Module

prepcart_prepcart.info.yml

name: IHM Premiere Prep Cart
description: Powers the My Cart functionality of Premiere Prep.
package: Custom

type: module
core: 8.x

dependencies:
  - entityqueue:entityqueue
  - drupal:views

configure: prepcart.settings

prepcart_prepcart.routing.yml

prepcart.content:
  path: '/cart'
  defaults:
    _controller: '\Drupal\prepcart\Controller\PrepCartController::content'
    _title: 'Hello Cart'
  requirements:
    _permission: 'access content'

prepcart_src_Controller_PrepCartController.php

<?php
/**
 * @file
 * Contains \Drupal\prepcart\Controller\PrepCartController.
 */

namespace Drupal\prepcart\Controller;

use Drupal\Core\Controller\ControllerBase;

class PrepCartController extends ControllerBase {
  public function content() {
    return array(
      '#type' => 'markup',
      '#markup' => $this->t('Hello, IHM!'),
    );
  }
};