Add basic README.md

Author: stringbean

README.md

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+[![Build Status](https://img.shields.io/travis/stringbean/scala-xml-compare/master.svg)](https://travis-ci.org/stringbean/scala-xml-compare)
+[![Test Coverage](https://img.shields.io/codecov/c/github/stringbean/scala-xml-compare/master.svg)](https://codecov.io/gh/stringbean/scala-xml-compare)
+[![Maven Central - Scala 2.11](https://img.shields.io/maven-central/v/software.purpledragon.xml/xml-compare_2.11.svg?label=scala%202.11)](http://search.maven.org/#search%7Cga%7C1%7Cg%3A%22software.purpledragon%22%20a%3A%22xml-compare_2.11%22)
+[![Maven Central - Scala 2.12](https://img.shields.io/maven-central/v/software.purpledragon.xml/xml-compare_2.12.svg?label=scala%202.12)](http://search.maven.org/#search%7Cga%7C1%7Cg%3A%22software.purpledragon%22%20a%3A%22xml-compare_2.12%22)
+
+# XML Comparison Utils for Scala