/**
  * Constructor function.
  * @param string $file __FILE__ of the main plugin
  * @access  private
  * @since   1.0.0
  */
 private function __construct($file)
 {
     self::$token = 'ppb-post-builder';
     self::$file = $file;
     self::$url = plugin_dir_url($file);
     self::$path = plugin_dir_path($file);
     self::$version = '1.0.0';
     add_action('init', array($this, 'init'));
 }
<?php

/*
Plugin Name: Pootle Post Builder Addon
Plugin URI: http://pootlepress.com/
Description: Enables you to use the pootle page builder to build awesome posts
Author: pootlepress
Version: 1.0.0
Author URI: http://pootlepress.com/
@developer shramee <*****@*****.**>
*/
/** Including Main Plugin class */
require 'class-ppb-post-builder.php';
/** Intantiating main plugin class */
PPB_Post_Builder_Addon::instance(__FILE__);