Add Flextype Content Management System

Hello!
I am founder and lead developer of Flextype CMS. 
I would appreciate it if you could add my project to the list.

Best regards,
Sergey Romanenko

README.md

@@ -532,6 +532,7 @@ _CMS are a practical way to setup a website with many features. CMS often come w
 - [Drupal](https://www.drupal.org/) - Advanced open source content management platform. ([Source Code](http://cgit.drupalcode.org/drupal)) `GPL-2.0` `PHP`
 - [eLabFTW](http://www.elabftw.net) - Online lab notebook for research labs. Store experiments, use a database to find reagents or protocols, use trusted timestamping to legally timestamp an experiment, export as pdf or zip archive, share with collaborators…. ([Demo](https://demo.elabftw.net), [Source Code](https://github.com/elabftw/elabftw)) `AGPL-3.0` `PHP`
 - [Expressa](https://github.com/thomas4019/expressa) - Content Management System for powering database driven websites using JSON schemas. Provides permission management and automatic REST APIs. `MIT` `Nodejs`
+- [Flextype](https://flextype.org/) - Flextype is an open-source Hybrid Content Management System with the freedom of a headless CMS and with the full functionality of a traditional CMS. ([Demo](https://demo.flextype.org/), [Source Code](https://github.com/flextype/flextype)) `MIT` `PHP`
 - [GetSimple CMS](http://get-simple.info/) - The Simplest Content Management System. Ever. ([Source Code](https://github.com/GetSimpleCMS/GetSimpleCMS)) `GPL-3.0` `PHP`
 - [Joomla!](https://www.joomla.org/) - Advanced Content Management System (CMS). ([Source Code](https://github.com/joomla/joomla-cms)) `GPL-2.0` `PHP`
 - [KeystoneJS](http://keystonejs.com/) - CMS and Web Application Platform. ([Demo](http://demo.keystonejs.com/), [Source Code](https://github.com/keystonejs/keystone)) `MIT` `Nodejs`