NEWS + README

Author: dfalbel

NEWS.md

@@ -3,6 +3,8 @@
 
 - Use `tf.keras` as default implementation module.
 
+- Added AppVeyor to test on Windows.
+
 
 ## Keras 2.2.4 (CRAN)
 

README.md

@@ -3,6 +3,7 @@
 ![](https://s3.amazonaws.com/keras.io/img/keras-logo-2018-large-1200.png)
 
 [![Travis-CI Build Status](https://travis-ci.org/rstudio/keras.svg?branch=master)](https://travis-ci.org/rstudio/keras) 
+[![AppVeyor Build Status](https://ci.appveyor.com/api/projects/status/github/rstudio/keras?branch=master&svg=true)](https://ci.appveyor.com/project/rstudio/keras)
 [![CRAN_Status_Badge](http://www.r-pkg.org/badges/version/keras)](http://cran.r-project.org/package=keras)
 [![license](https://img.shields.io/github/license/mashape/apistatus.svg?maxAge=2592000)](https://github.com/fchollet/keras/blob/master/LICENSE)