Update Readme.md Add appveyor badge

Author: sreeder

README.md

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 [![Build Status](https://travis-ci.org/ODM2/ODM2PythonAPI.svg?branch=master)](https://travis-ci.org/ODM2/ODM2PythonAPI)
 
+[![Build status](https://ci.appveyor.com/api/projects/status/47pry4brcrlls6hd/branch/master?svg=true)](https://ci.appveyor.com/project/sreeder/odm2pythonapi/branch/master)
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 A Python-based application programmer's interface for the [Observations Data Model 2 (ODM2)](http://odm2.org).
 
 [List of current and planned functions included in the API](https://github.com/ODM2/ODM2PythonAPI/blob/master/doc/APIFunctionList.md)