Add PropertyWebBuilder (#1068)

* Add PropertyWebBuilder

This is a real estate website builder.  Doesn't seem to fit in any of the defined categories so added it to "Misc/Other"

* Create README.md

Move PropertyWebBuilder into the CMS section

README.md

@@ -456,6 +456,7 @@ CMS are a practical way to setup a website with many features. CMS often come wi
   * [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)) `Zope` `Python`
   * [ProcessWire](https://processwire.com/) - ProcessWire is an open source content management system (CMS) and web application framework aimed at the needs of designers, developers and their clients. ([Source Code](https://github.com/ryancramerdesign/ProcessWire)) `MPLv2` `PHP`
+  * [PropertyWebBuilder](http://propertywebbuilder.com) - The ultimate Ruby on Rails engine for creating real estate websites. ([Demo](https://propertywebbuilder.herokuapp.com), [Source Code](https://github.com/etewiah/property_web_builder)) `MIT` `Ruby`
   * [Publify](http://publify.co/) - A simple but full featured web publishing software. ([Demo](http://demo.publify.co/), [Source Code](https://github.com/publify/publify)) `MIT` `Ruby`
   * [REDAXO](https://www.redaxo.org) - A simple, flexible and useful content management system (documentation only available in German). ([Source Code](https://github.com/redaxo/redaxo)) `MIT` `PHP`
   * [Redaxscript](https://redaxscript.com) - Ultra lightweight CMS for MySQL, SQLite and PostgreSQL. ([Demo](https://demo.redaxscript.com/demo/login), [Source Code](https://github.com/redaxmedia/redaxscript)) `GPLv3` `PHP`