Explain who maintains this image

We either need to explain that this is maintained by the Docker community or pull the image from docker.  We are getting push back on our side about this.

drupal/content.md

@@ -6,6 +6,9 @@ Drupal is a free and open-source content-management framework written in PHP and
 
 %%LOGO%%
 
+# Who maintains this
+This image is not maintained by the Drupal community or the Drupal security team.  This issue is maintained by the docker community. 
+
 # How to use this image
 
 The basic pattern for starting a `%%REPO%%` instance is: