Adding appveyor badge

Author: nehashri

README.md

@@ -1,6 +1,7 @@
 # Gauge-Python
 
 [![Build Status](https://travis-ci.org/getgauge/gauge-python.svg?branch=master)](https://travis-ci.org/getgauge/gauge-python)
+[![Build status](https://ci.appveyor.com/api/projects/status/ltbeao568cmyx566/branch/master?svg=true)](https://ci.appveyor.com/project/getgauge/gauge-python/branch/master)
 
 This project adds Python [language plugin](https://docs.gauge.org/plugins.html#language-reporting-plugins) for [gauge](http://getgauge.io).