Added a Windows CI build (via AppVeyor)

Author: JamesMessinger

README.md

@@ -3,6 +3,8 @@ Simplifyify
 #### A simplified Browserify and Watchify CLI
 
 [![Build Status](https://api.travis-ci.org/BigstickCarpet/simplifyify.svg)](https://travis-ci.org/BigstickCarpet/simplifyify)
+[![Windows Build Status](https://ci.appveyor.com/api/projects/status/github/BigstickCarpet/simplifyify?svg=true&failingText=Windows%20build%20failing&passingText=Windows%20build%20passing)](https://ci.appveyor.com/project/BigstickCarpet/simplifyify)
+
 [![Dependencies](https://david-dm.org/BigstickCarpet/simplifyify.svg)](https://david-dm.org/BigstickCarpet/simplifyify)
 [![Code Climate Score](https://codeclimate.com/github/BigstickCarpet/simplifyify/badges/gpa.svg)](https://codeclimate.com/github/BigstickCarpet/simplifyify)
 [![Codacy Score](https://www.codacy.com/project/badge/e7d74b7748674054be73556c87475c49)](https://www.codacy.com/public/jamesmessinger/simplifyify)