Added badge to README

README.md

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-OpenMM Test Systems
-===========
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+
+# OpenMM Test Systems
+
+Test systems for OpenMM
+
+# Description
 
 This repository contains a suite of molecular systems that can be used
 for the testing of various molecular mechanics related software.  The
 idea is that this repository will host a number classes that generate
-OpenMM objects for simulating the desired systems.  
+OpenMM objects for simulating the desired systems.
 
 These classes will also contain the member functions that calculate known
 analytical properties of these systems, enabling the proper testing.