Add codacy badge to README

Author: imagejan

README.md

@@ -1,4 +1,5 @@
 # batch-processor
 [![Build Status](https://travis-ci.org/scijava/batch-processor.svg?branch=master)](https://travis-ci.org/scijava/batch-processor)
+[![Codacy Badge](https://api.codacy.com/project/badge/Grade/6315ca3348cf4d30820e84b1636470e9)](https://www.codacy.com/app/imagejan/batch-processor?utm_source=github.com&utm_medium=referral&utm_content=fmi-faim/batch-processor&utm_campaign=Badge_Grade)
 
 A Batch Processor for SciJava