Adding Customer Attributes to Magento Product Session by Install Script

My Script like this :
<?php
/* @var $installer Mage_Core_Model_Resource_Setup */
$installer = $this;
$connection = $installer->getConnection();
$setup = new Mage_Eav_Model_Entity_Setup(‘core_setup’);
$installer->startSetup();
$entityTypeId = $setup->getEntityTypeId(‘catalog_product’);
$attributeSetId = $setup->getDefaultAttributeSetId($entityTypeId);
$attributeGroupId = $setup->getDefaultAttributeGroupId($entityTypeId, $attributeSetId);
$setup->addAttribute(‘catalog_product’, ‘shippingprice’, array(
‘group’ => ‘Prices’,
‘type’ => ‘text’,
‘input’ => ‘price’,
‘label’ => ‘Shipping Price’,
‘visible’ => 1,
‘required’ => 1,
‘default’ => 0,
‘sort_order’=> 1
));
$installer->endSetup();