SLING-3814 - Groovy fragment bundle for Commons Log to support scriptable event evaluation

git-svn-id: https://svn.apache.org/repos/asf/sling/trunk@1615513 13f79535-47bb-0310-9956-ffa450edef68
SLING-3814 - Groovy fragment bundle for Commons Log to support scriptable event evaluation

Add a readme

git-svn-id: https://svn.apache.org/repos/asf/sling/trunk@1615516 13f79535-47bb-0310-9956-ffa450edef68