update readme

Author: mikaelcom

README.md

@@ -1,4 +1,7 @@
 # Package Base
+
+> Classes that are used by the classes generated by the [PackageGenerator](https://github.com/WsdlToPhp/PackageGenerator) project to ease the SoapClient UX.
+
 [![Latest Stable Version](https://poser.pugx.org/wsdltophp/packagebase/version.png)](https://packagist.org/packages/wsdltophp/packagebase)
 [![Total Downloads](https://poser.pugx.org/wsdltophp/packagebase/downloads)](https://packagist.org/packages/wsdltophp/packagebase)
 [![Build Status](https://api.travis-ci.org/WsdlToPhp/PackageBase.svg)](https://travis-ci.org/WsdlToPhp/PackageBase)
@@ -9,8 +12,11 @@
 [![StyleCI](https://styleci.io/repos/38760239/shield)](https://styleci.io/repos/38760239)
 [![SensioLabsInsight](https://insight.sensiolabs.com/projects/bfbc0c8f-5793-489b-8151-36ea149ec98d/mini.png)](https://insight.sensiolabs.com/projects/bfbc0c8f-5793-489b-8151-36ea149ec98d)
 
+The goal is to provide generic and useful classes that are on top of the classes generated by the [PackageGenerator](https://github.com/WsdlToPhp/PackageGenerator) project.
+
+For example, it allows to easily loop through the array elements of a SOAP result object property, it allows to easily set HTP headers and SOAP headers for a SOAP request and it allows to easily populate an object from its array state.
+
 ## Main features
-This project contains base classes used as parent class by the generated classes from [PackageGenerator](https://github.com/WsdlToPhp/PackageGenerator):
 - [Interfaces](#the-interfaces)
     - [StructInterface](#structinterface)
     - [StructArrayInterface](#structarrayinterface)