Update README.md

Author: Dirkster99

README.md

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-# DropDownButtonLib
+[![Release](https://img.shields.io/github/release/Dirkster99/DropDownButtonLib.svg)](https://github.com/Dirkster99/DropDownButtonLib/releases/latest)
+[![NuGet](https://img.shields.io/nuget/dt/Dirkster.DropDownButtonLib.svg)](http://nuget.org/packages/Dirkster.DropDownButtonLib)
+# Overview
 The DropDownButtonLib project supplies MVVM/WPF drop down controls that are based on a button. 
 
 Download from [nuget](https://preview.nuget.org/packages/Dirkster.DropDownButtonLib/)