SLING-7167 Adjust READMEs

add uniform header linking to Sling project

git-svn-id: https://svn.apache.org/repos/asf/sling/trunk@1810862 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/README.md b/README.md
index 89d00e5..a6a6e61 100644
--- a/README.md
+++ b/README.md
@@ -1,4 +1,6 @@
-Apache Sling JCR Repository Registration
+# Apache Sling JCR Repository Registration
+
+This module is part of the [Apache Sling](https://sling.apache.org) project.
 
 Bundle providing support to publish JCR repository services via RMI
 and/or JNDI