SLING-7167 Adjust READMEs

add uniform header linking to Sling project

git-svn-id: https://svn.apache.org/repos/asf/sling/trunk@1810898 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/README.md b/README.md
index 5a8a4b3..41c2b93 100644
--- a/README.md
+++ b/README.md
@@ -1,5 +1,7 @@
 # Apache Sling DataSource Provider
 
+This module is part of the [Apache Sling](https://sling.apache.org) project.
+
 Refer to [DataSource Provider][1]
 
 [1]: http://sling.apache.org/documentation/bundles/datasource-providers.html
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