SLING-7167 Adjust READMEs

add uniform header linking to Sling project

git-svn-id: https://svn.apache.org/repos/asf/sling/trunk@1810920 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/README.md b/README.md
index f0b2410..1682688 100644
--- a/README.md
+++ b/README.md
@@ -1,5 +1,6 @@
-Groovy scripting engine for Apache Sling
-----------------------------------------
+# Apache Sling Scripting Groovy Support
+
+This module is part of the [Apache Sling](https://sling.apache.org) project.
 
 This bundle provides just the Sling bridging code, it requires the groovy-all bundle
 to be installed separately.