Update README.md

Add appveyor badge

Author: Ingvord

README.md

@@ -4,6 +4,9 @@
 [![TangoControls](https://img.shields.io/badge/-Tango--Controls-7ABB45.svg?style=flat&logo=%20data%3Aimage%2Fpng%3Bbase64%2CiVBORw0KGgoAAAANSUhEUgAAACAAAAAkCAYAAADo6zjiAAAABHNCSVQICAgIfAhkiAAAAAlwSFlzAAALEwAACxMBAJqcGAAAAsFJREFUWIXtl01IFVEYht9zU%2FvTqOxShLowlOgHykWUGEjUKqiocB1FQURB0KJaRdGiaFM7gzZRLWpTq2olhNQyCtpYCP1gNyIoUTFNnxZzRs8dzvw4Q6564XLnfOf73vedc2a%2BmZEKALgHrC3CUUR8CxZFeEoFalsdM4uLmMgFoIlZLJp3A9ZE4S2oKehhlaR1BTnyg2ocnW%2FxsxEDhbYij4EPVncaeASMAavnS%2FwA8NMaqACNQCew3f4as3KZOYh2SuqTVJeQNiFpn6QGSRVjTH9W%2FiThvcCn6H6n4BvQDvQWFT%2BSIDIFDAKfE3KOAQeBfB0XGPeQvgE67P8ZoB44DvTHmFgJdOQRv%2BUjc%2BavA9siNTWemgfA3TwGquCZ3w8szFIL1ALngIZorndvgJOR0GlP2gtJkzH%2Bd0fGFxW07NqY%2FCrx5QRXcYjbCbmxF1dkBSbi8kpACah3Yi2Sys74cVyxMWY6bk5BTwgRe%2BYlSzLmxNpU3aBeJogk4XWWpJKUeiap3RJYCpQj4QWZDQCuyIAk19Auj%2BAFYGZZjTGjksaBESB8P9iaxUBIaJzjZcCQcwHdj%2BS2Al0xPOeBYYKHk4vfmQ3Y8YkIwRUb7wQGU7j2ePrA1URx93ayd8UpD8klyPbSQfCOMIO05MbI%2BDvwBbjsMdGTwlX21AAMZzEerkaI9zFkP4AeYCPBg6gNuEb6I%2FthFgN1KSQupqzoRELOSed4DGiJala1UmOMr2U%2Bl%2FTWEy9Japa%2Fy41IWi%2FJ3d4%2FkkaAw0Bz3AocArqApwTvet3O3GbgV8qqjAM7bf4N4KMztwTodcYVyelywKSCD5V3xphNXoezuTskNSl4bgxJ6jPGVJJqbN0aSV%2Bd0M0aO7FCs19Jo2lExphXaTkxdRVgQFK7DZVDZ8%2BcpdmQh3wuILh7ut3AEyt%2B51%2BL%2F0cUfwFOX0t0StltmQAAAABJRU5ErkJggg%3D%3D)](http://www.tango-controls.org)
 
 [![Build Status](https://travis-ci.org/tango-controls/cppTango.svg?branch=master)](https://travis-ci.org/tango-controls/cppTango)
+[![Build status](https://ci.appveyor.com/api/projects/status/hcvq2p7imb54g1sa?svg=true)](https://ci.appveyor.com/project/Ingvord/cpptango)
+
+
 [![Coverage Status](https://coveralls.io/repos/github/tango-controls/cppTango/badge.svg?branch=master)](https://coveralls.io/github/tango-controls/cppTango?branch=master)
 [![Codacy Badge](https://api.codacy.com/project/badge/Grade/50bbab581a5d460d86200e68e2f460e4)](https://www.codacy.com/app/Ingvord/cppTango?utm_source=github.com&utm_medium=referral&utm_content=tango-controls/cppTango&utm_campaign=Badge_Grade)
 [![License](https://img.shields.io/badge/license-LGPL--3.0-blue.svg)](https://github.com/tango-controls/cppTango/blob/master/LICENSE)