Update README.md

Author: SebKay

README.md

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-# wp-oop
+# WP OOP
 A simple library of OOP style helpers for WordPress theme and plugin development.
+
+## What is this?
+WP OOP is a package that give you a load of handy classes and methods to use when building things in WordPress.
+
+It can give you well-formatted classes like User and Post which can then be extended into sub-classes in your own projects.