Update readme.

README.md

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-[![Release](https://img.shields.io/badge/Release-v18.6.20-brightgreen.svg?style=plastic)](https://github.com/Port-Able/Port-Able-Suite/releases/latest) [![License](https://img.shields.io/badge/License-GNU%20GPL%20v3.0-blue.svg?style=plastic)](https://github.com/Port-Able/Port-Able-Suite/blob/master/LICENSE.txt)
+[![Release](https://img.shields.io/badge/Release-v18.6.21-brightgreen.svg?style=plastic)](https://github.com/Port-Able/Port-Able-Suite/releases/latest) [![License](https://img.shields.io/badge/License-GNU%20GPL%20v3.0-blue.svg?style=plastic)](https://github.com/Port-Able/Port-Able-Suite/blob/master/LICENSE.txt)
 
 # [Port-Able Suite](http://apps.suite.si13n7.com/)
 
+The Port-Able Suite helps you manage a collection of portable apps. It lets you easily download new apps, automatically searches for app updates, and more.
+
 #### What the hell is a portable app?
 
 A portable app is a software that will not take an effect to your running system. What happens in a portable app stays in a portable app. That means that you can carry around your applications on a portable device and use it on any computer.