Update README.md

Doxygen links added and a nice headline for the CI statuses

Author: fallberg

README.md

@@ -5,6 +5,12 @@ MySensors Arduino Library v2.0.0-beta
 
 Please visit www.mysensors.org for more information
 
+Doxygen
+-------
+[master](https://ci.mysensors.org/job/MySensorsArduino/branch/master/Doxygen_HTML/index.html) [development](https://ci.mysensors.org/job/MySensorsArduino/branch/development/Doxygen_HTML/index.html)
+
+CI statuses
+-----------
 Current build status of master branch: [![Build Status](http://ci.mysensors.org/job/MySensorsArduino/branch/master/badge/icon)](http://ci.mysensors.org/job/MySensorsArduino/branch/master/)
 
 Current build status of development branch: [![Build Status](http://ci.mysensors.org/job/MySensorsArduino/branch/development/badge/icon)](http://ci.mysensors.org/job/MySensorsArduino/branch/development/)