Add clojars badge

Signed-off-by: Greg Haskins <[email protected]>

Author: ghaskins

README.md

@@ -1,5 +1,7 @@
 # Temporal Clojure SDK [![CircleCI](https://dl.circleci.com/status-badge/img/gh/manetu/temporal-clojure-sdk/tree/master.svg?style=svg)](https://dl.circleci.com/status-badge/redirect/gh/manetu/temporal-clojure-sdk/tree/master)
 
+[![Clojars Project](https://img.shields.io/clojars/v/io.github.manetu/temporal-sdk.svg)](https://clojars.org/io.github.manetu/temporal-sdk)
+
 [Temporal](https://github.com/temporalio/temporal) is a Workflow-as-Code platform for building and operating
 resilient applications using developer-friendly primitives, instead of constantly fighting your infrastructure.