Add maven central badge with the latest version published

Change-Id: Ia98b184e8e0a8cfb95caeeef61667b20b62e4991
diff --git a/README.md b/README.md
index e6fb552..084f2b0 100644
--- a/README.md
+++ b/README.md
@@ -4,6 +4,7 @@
 management tool for Git based projects.
 
 [![Build Status](https://gerrit-ci.gerritforge.com/job/Gerrit-bazel-master/badge/icon)](https://gerrit-ci.gerritforge.com/job/Gerrit-bazel-master/)
+![Maven Central](https://img.shields.io/maven-central/v/com.google.gerrit/gerrit-war)
 
 ## Objective