Merge pull request #359 from pengc99/patch-1

Add Plone

README.md

@@ -319,6 +319,7 @@ CMS are a practical way to setup a website with many features. CMS often come wi
   * [Pagekit](http://pagekit.com/) - A new modern CMS to create and share ([Source code](https://github.com/pagekit/pagekit)) `MIT`
   * [Pico](http://picocms.org/) - A stupidly simple, blazing fast, flat file CMS. ([Source code](https://github.com/picocms/Pico)) `MIT`
   * [Pimcore](https://www.pimcore.org/) Multi-Channel Experience and Engagement Management Platform ([Source code](https://github.com/pimcore/pimcore)) `BSD` `PHP`
+  * [Plone](https://plone.org/) Powerful open-source CMS system ([Source code](https://github.com/plone)) `Python` `Zope`
   * [Redaxscript](http:/redaxscript.com) - Ultra lightweight CMS for MySQL, SQLite and PostgreSQL ([Demo](http://demo.redaxscript.com/demo/login), [Source Code](https://github.com/redaxmedia/redaxscript)) `GPLv3` `PHP`
   * [SilverStripe](https://www.silverstripe.org) - easy to use CMS with powerful MVC framework underlying. ([Demo](http://demo.silverstripe.org/), [Source code](https://github.com/silverstripe)) `BSD` `PHP`
   * [SPIP](http://www.spip.net/fr) - Publication system for the Internet aimed at collaborative work, multilingual environments, and simplicity of use for web authors. ([Source code](https://core.spip.net/projects/spip/repository)) `GPLv2` `PHP`