add badge to README.md

Author: Andreas Dann

README.md

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+![Maven Build](https://github.com/secure-software-engineering/sootdiff/actions/workflows/maven.yml/badge.svg)
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 # SootDiff - Bytecode Comparison Across Different Java Compilers
 
 This repository hosts the SootDiff analysis tool. SootDiff allows the comparison of the Java ByteCode create by different Java compilers.
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 ## License
 SootDiff is licensed under the MIT license, see LICENSE file. This basically means that you are free to use the tool (even in commercial, closed-source projects). 
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+# Use SootDiff to compare Jars
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+The class `src/test/java/MainCompareArtifacts.java` can be used to compare multiple jars on the basis of class sha,tlshs and timestamps and produces a markdown report of that.
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+Invoke the main method with parameters `-inJars jar1,jar2,jar3 -fileFilter pathToFilterFile.txt`
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+The filter file can be used to specify classes of interest (e.g. classes fixed in a fixing commit). Make sure to specify the files as they would be located in the analyzed jar, e.g., in a commit the change might be related to `src/main/java/pack/a/b.java`, in the jar it would be referenced from the package onwards and in class format: `pack/a/b.class`.