Update README.md

Author: Dirkster99

README.md

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-[![Release](https://img.shields.io/github/release/Dirkster99/SuggestBoxLib.svg)](https://github.com/Dirkster99/SuggestBoxLib/releases/latest)
-[![NuGet](https://img.shields.io/nuget/dt/Dirkster.SuggestBoxLib.svg)](http://nuget.org/packages/Dirkster.SuggestBoxLib)
+[![Build status](https://ci.appveyor.com/api/projects/status/nw16d7fi59x0se0p?svg=true)](https://ci.appveyor.com/project/Dirkster99/suggestboxlib) [![Release](https://img.shields.io/github/release/Dirkster99/SuggestBoxLib.svg)](https://github.com/Dirkster99/SuggestBoxLib/releases/latest) [![NuGet](https://img.shields.io/nuget/dt/Dirkster.SuggestBoxLib.svg)](http://nuget.org/packages/Dirkster.SuggestBoxLib)
 
 The SuggestBox control in this repository was originally developed by <b>Leung Yat Chun Joseph <a href="https://github.com/lycj">lycj</a></b> in his FileExplorer application originating from CodePlex and <a href="https://www.codeproject.com/Members/Fainx">CodeProject</a>.