earth IndexController.php

// module/hello/Earth/src/Earth/Controller/IndexController.php
namespace hello\Earth\Controller;

use Zend\Mvc\Controller\AbstractActionController;
use Zend\View\Model\ViewModel;

class IndexController extends AbstractActionController
{
    public function indexAction()
    {
        return new ViewModel(array(
           'varName' => 'hello from vendor earth',
         ));
    }
}