Added Directus Headless CMS (#687)

README.md

@@ -358,6 +358,7 @@ CMS are a practical way to setup a website with many features. CMS often come wi
   * [CMS Made Simple](http://www.cmsmadesimple.org/) - Open source content management system, faster and easier management of website contents, scalable for small businesses to large corporations. ([Source Code](http://svn.cmsmadesimple.org/svn/cmsmadesimple/trunk/)) `GPL` `PHP`
   * [Concrete 5 CMS](http://www.concrete5.org/) - An open source content management system. ([Source Code](https://github.com/concrete5/concrete5)) `MIT` `PHP`
   * [CouchCMS](http://www.couchcms.com/) - Simple Open-Source CMS for designers. ([Source Code](https://github.com/CouchCMS/CouchCMS)) `CPALv1` `PHP`
+  * [Directus](http://getdirectus.com/) - Directus is a powerful and intuitive headless CMS for managing SQL databases with custom architectures. Built around a robust and extensible API, this decoupled content management framework is perfect for websites, apps, or multi-client projects. ([Source Code](https://github.com/directus/directus)) `GPL` `PHP`
   * [Drupal](https://www.drupal.org/) - Advanced open source content management platform. ([Source Code](http://cgit.drupalcode.org/drupal)) `GPL` `PHP`
   * [eLabFTW](http://www.elabftw.net) - An 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…. ([Source Code](https://github.com/elabftw/elabftw), [Demo](https://demo.elabftw.net)) `AGPLv3` `PHP`
   * [Grav](https://getgrav.org/) - Modern, Crazy Fast, Ridiculously Easy and Amazingly Powerful Flat-File CMS. ([Source Code](https://github.com/getgrav/grav)) `MIT` `PHP`