Add a resource to the the list allowing access to an action
$acl->addResource(new Phalcon\Acl\Resource('customers'), 'search');
$acl->addResource('customers', 'search');
Add a resource with an access list
$acl->addResource(new Phalcon\Acl\Resource('customers'), ['create', 'search']);
$acl->addResource('customers', ['create', 'search']);