Update README.md

README.md

@@ -25,6 +25,7 @@ Like what we do? Want to join us? Check out our job listings on our [career page
 
 * [Overview](#overview)
 * [Support](#we-are-here-to-help)
+* [Functionalities](#functionalities)
 * [About us](#about-us)
     * [Community](#community)
 * [Demo](#demo)
@@ -46,6 +47,12 @@ This **open-source plugin was developed to help the Sylius community**. If you h
 
 [![](https://bitbag.io/wp-content/uploads/2020/10/button-contact.png)](https://bitbag.io/contact-us/?utm_source=github&utm_medium=referral&utm_campaign=plugins_mailchimp)
 
+
+# Functionalities
+
+All main functionalities of the plugin are described [here.](https://github.com/BitBagCommerce/SyliusMailChimpPlugin/blob/master/doc/functionalities.md)
+
+
 # About us
 
 ---