controller.php

<?php 
namespace Concrete\Package\SocialShareLite;

use Concrete\Core\Backup\ContentImporter;
use Concrete\Core\Block\BlockType\BlockType;
use Concrete\Core\Block\BlockType\Set as BlockTypeSet;

class Controller extends \Concrete\Core\Package\Package
{
    protected $pkgHandle = 'social_share_lite';
    protected $appVersionRequired = '5.7.2.1';
    protected $pkgVersion = '2.1.4';
    
    public function getPackageDescription()
    {
        return t("Add social sharing buttons");
    }
    
    public function getPackageName()
    {
        return t("Social Share Lite");
    }
    
    public function install()
    {
        $pkg = parent::install();
        
        $ci = new ContentImporter();
        $ci->importContentFile($pkg->getPackagePath() . '/config/install.xml');
        
        $bt = BlockType::getByHandle('social_share_lite');
        $btSet = BlockTypeSet::getByHandle('social');
        if (is_object($bt) && is_object($btSet)) {
            $btSet->addBlockType($bt);
        }
    }

}