Update README.md

Added Cockpit CMS

README.md

@@ -488,6 +488,7 @@ CMS are a practical way to setup a website with many features. CMS often come wi
 - [BigTree CMS](https://www.bigtreecms.org/) - Straightforward, well documented, and capable written with PHP and MySQL. ([Source Code](https://github.com/bigtreecms/BigTree-CMS)) `LGPL-2.1` `PHP`
 - [Bolt CMS](https://bolt.cm/) - Open source Content Management Tool, which strives to be as simple and straightforward as possible. ([Demo](https://try.bolt.cm/), [Source Code](https://github.com/bolt/bolt)) `MIT` `PHP`
 - [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-1.0` `PHP`
+- [Cockpit](http://getcockpit.com) - Simple Content Platform to manage any structured content. ([Source Code](https://github.com/agentejo/cockpit5)) `MIT` `PHP`
 - [Concrete 5 CMS](http://www.concrete5.org/) - 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)) `CPAL-1.0` `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-3.0` `PHP`