Added CodeIgniter Framework (#2551)

* Added CodeIgniter Framework

* Added CodeIgniter Framework

* Update free-programming-books-ru.md

free-programming-books-ru.md

@@ -194,6 +194,8 @@
 
 ### PHP
 
+* CodeIgniter Framework
+  * [CodeIgniter 2.1.3](http://php5.kiev.ua/codeigniter/)
 * [PHP: Правильный Путь](http://getjump.github.io/ru-php-the-right-way/)
 * [Руководство по PHP](http://docs.php.net/manual/ru/)
 * [Самоучитель (учебник) по PHP](http://www.php-s.ru/self-teacher/)

free-programming-books.md

@@ -1725,6 +1725,9 @@ For resources on Angular, Backbone, D3, Dojo, Ember, Express, jQuery, Knockout,
 
 * CakePHP Framework
   * [CakePHP Cookbook 2.x](http://book.cakephp.org/2.0/_downloads/en/CakePHPCookbook.pdf) (PDF)
+* CodeIgniter Framework
+  * [CodeIgniter 2.2.6](https://codeigniter.com/userguide2/)
+  * [CodeIgniter 3.1.6](https://www.codeigniter.com/user_guide/)
 * Drupal Framework
   * Drupal 7
     * [The Tiny Book of Rules](https://www.drupal.org/files/tiny-book-of-rules.pdf) (PDF)