Add code coverage

Author: lukaszimmermann

README.md

@@ -1,13 +1,9 @@
 [![Build Status](https://travis-ci.org/PersonalHealthTrain/train-api-python.svg?branch=master)](https://travis-ci.org/PersonalHealthTrain/train-api-python)
+[![codecov](https://codecov.io/gh/PersonalHealthTrain/train-api-python/branch/master/graph/badge.svg)](https://codecov.io/gh/PersonalHealthTrain/train-api-python)
 # Python Library for building Train Images
 
-The documentation for this library is available here:
-
-https://lukas-zimmermann.gitbook.io/personal-health-train/images/python-library-for-implementing-train-images
-
+Can be used to implement trains that adhere to the Train API V1.
 
-The Image is available on Docker Hub:
-
-https://cloud.docker.com/u/personalhealthtrain/repository/docker/personalhealthtrain/train-api-python
+The documentation for this library is available here:
 
-This is the recommended version for a base of a Train image.
+https://www.overleaf.com/read/kddhmvhbvxpd