Revise README title and add badges

Updated the title and added CI and version badges.

Author: rhusar

README.adoc

@@ -1,5 +1,5 @@
 :toc:
-= JGroups AWS – `S3_PING`
+= JGroups AWS – `aws.S3_PING` image:https://github.com/jgroups-extras/jgroups-aws/workflows/CI/badge.svg[CI,link=https://github.com/jgroups-extras/jgroups-aws/actions] image:https://img.shields.io/maven-central/v/org.jgroups.aws/jgroups-aws?logo=apache-maven[Version,link=https://central.sonatype.com/artifact/org.jgroups.aws/jgroups-aws]
 
 Projects JGroups AWS provides an implementation of `S3_PING` discovery protocol using AWS S3 buckets as cluster information store.
 It is based on the original code written by Tobias Sarnowski at Zalando.