==== A new extension ====


It contains:


   * **Manifest**
     * Readme.txt
     * manifest.xml (???)
   * **Front-end parts**
     * Views
     * CSS
     * JS
   * **Backend**
     * Controller (1 or more than 1)
     * Model (1 or more than 1)
   * **Libraries**
     * Extesion Libraries (can be used cross extension)
     * Extension custom action library
   * **Configurations**
     * Config files
     * SQL updates;
       * Install.sql
       * Remove.sql