Adding badge

Author: michaeltryby

README.md

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 # swmm-python
 
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 ## Build Status
 [![Build status](https://ci.appveyor.com/api/projects/status/g13vapirwhinmtob/branch/dev?svg=true)](https://ci.appveyor.com/project/michaeltryby/swmm-python/branch/dev)
 
+[![Coverage Status](https://coveralls.io/repos/github/michaeltryby/swmm-python/badge.svg)](https://coveralls.io/github/michaeltryby/swmm-python)
+
+
 ## Contents
-* swmm-python - SWIG based wrappers for the SWMM Toolkit and Output libraries. 
+* swmm-python - SWIG based wrappers for the SWMM Toolkit and Output libraries.
 * ...
 
-## Build Notes 
+
+## Build Notes
 Note that swmm-python wraps the feature-wrapper branch of SWMM v5.1.12.