Added description to webmail clients - email

As per issue #2984

README.md

@@ -442,6 +442,8 @@ Mailing lists servers and mass mailing software - one message to many recipients
 
 **[`^        back to top        ^`](#)**
 
+[Webmail](https://en.wikipedia.org/wiki/Webmail) clients for email 
+
 - [Afterlogic WebMail Lite](https://afterlogic.org/webmail-lite) - Fast and easy-to-use webmail front-end for your existing IMAP mail server, Plesk or cPanel. ([Demo](https://lite.afterlogic.com/), [Source Code](https://github.com/afterlogic/webmail-lite)) `AGPL-3.0` `PHP`
 - [Cypht](https://cypht.org) - Feed reader for your email accounts. ([Source Code](https://github.com/jasonmunro/cypht)) `LGPL-2.1` `PHP`
 - [IMP](https://www.horde.org/apps/imp/) - HORDE application that provides webmail access to IMAP and POP3 accounts. ([Demo](http://demo.horde.org/), [Source Code](https://www.horde.org/download/imp)) `GPL-2.0` `PHP`