initial commit of the hawkBit documentation (#343)

Signed-off-by: Michael Hirsch <michael.hirsch@bosch-si.com>

docs/src/main/resources/ctymailingllist.md

@@ -0,0 +1,12 @@
+---
+layout: default
+title: "Mailing List"
+series : "homepagebottom"
+sequence: "mailinglist"
+imagename : "fa fa-envelope fa-4x"
+style: "team"
+accesslink: "https://dev.eclipse.org/mailman/listinfo/hawkbit-dev"
+---
+{% include base.html %}
+
+A great way to stay up to date with hawkBit activity is to subscribe to the **Mailing list** provided by Eclipse. Sign up for the mailing list <a href="https://dev.eclipse.org/mailman/listinfo/hawkbit-dev" target="_blank">here.</a>