SLING-8570 - Extract a generic Content Parser API from org.apache.sling.jcr.contentparser with pluggable implementations

* added README, CODE_OF_CONDUCT, CONTRIBUTING, LICENSE and .gitignore files
to each module
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+Apache Sling Content Parser Test Utilities
+====
+This module is part of the [Apache Sling](https://sling.apache.org) project.
+
+The Apache Sling Content Parser Test Utilities provides helper classes for writing tests for [`org.apache.sling.contentparser.api`](https://github.com/apache/sling-whiteboard/tree/master/contentparser/org-apache-sling-contentparser-api) implementations.