SLING-7167 Adjust READMEs

add uniform header linking to Sling project

git-svn-id: https://svn.apache.org/repos/asf/sling/trunk@1810897 13f79535-47bb-0310-9956-ffa450edef68
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-Cassandra Resource Provider for Apache Sling
-============================================
+# Apache Sling Cassandra Resource Provider
+
+This module is part of the [Apache Sling](https://sling.apache.org) project.
+
 Initially contributed by Dishara Wijewardana as part of GSoC 2013.
 
 This doc will guide on how to setup Cassandra resource provider with