Creating Magento product attributes programatically

upgrade-1.0.0-1.0.1.php

<?php
$installer = $this;
$installer->startSetup();

$this->addAttribute('catalog_product','brown_product_info',
    array (
        'group'             => 'General',
        'type'              => 'text',
        'visible_on_front'  => true,
        'label'             => 'Brown Product Info',
        'input'             => 'textarea',
        'global'            => Mage_Catalog_Model_Resource_Eav_Attribute::SCOPE_STORE,
        'visible'           => true,
        'wysiwyg_enabled'   => true,
        'default'           => '',
        'class'             => '',
        'backend'           => '',
        'source'            => '' 
    )
);

$this->addAttribute('catalog_product','grey_product_info',
    array (
        'group'             => 'General',
        'type'              => 'text',
        'visible_on_front'  => true,
        'label'             => 'Grey Product Info',
        'input'             => 'textarea',
        'global'            => Mage_Catalog_Model_Resource_Eav_Attribute::SCOPE_STORE,
        'visible'           => true,
        'wysiwyg_enabled'   => true,
        'default'           => '',
        'backend'           => '',
        'class'             => '',
        'source'            => '' 
    )
);

$installer->addAttribute('catalog_product', "bestseller_favourite", array(
    'type'       => 'varchar',
    'input'      => 'select',
    'label'      => 'Bestseller_Favourite',
    'required'   => true,
    'global'     => Mage_Catalog_Model_Resource_Eav_Attribute::SCOPE_STORE,
    'backend'    => 'eav/entity_attribute_backend_array',
    'visible_on_front'  => true,
    'option'     => array (
        'values' => array(
            0 => 'Bestseller',
            1 => 'Favourite',
            2 => 'none',
        )
    ),

));



$installer->endSetup();