SLING-7167 Adjust READMEs

add uniform header linking to Sling project

git-svn-id: https://svn.apache.org/repos/asf/sling/trunk@1810879 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/README.md b/README.md
index 5cc4c9b..26e0019 100644
--- a/README.md
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@@ -1,5 +1,6 @@
-Apache Sling Scripting HTL Sling Models Use Provider
-==================================================
+# Apache Sling Scripting HTL Sling Models Use Provider
+
+This module is part of the [Apache Sling](https://sling.apache.org) project.
 
 The Apache Sling Scripting HTL Sling Models Use Provider adds support for accessing
 [Sling Models](https://sling.apache.org/documentation/bundles/models.html)