Add badges. (#32)


diff --git a/README.md b/README.md
index 57c60b9..95f8480 100644
--- a/README.md
+++ b/README.md
@@ -19,6 +19,9 @@
 
 # Apache OpenWhisk runtimes for Ruby
 [![Build Status](https://travis-ci.org/apache/openwhisk-runtime-ruby.svg?branch=master)](https://travis-ci.org/apache/openwhisk-runtime-ruby)
+[![License](https://img.shields.io/badge/license-Apache--2.0-blue.svg)](http://www.apache.org/licenses/LICENSE-2.0)
+[![Join Slack](https://img.shields.io/badge/join-slack-9B69A0.svg)](http://slack.openwhisk.org/)
+[![Twitter](https://img.shields.io/twitter/follow/openwhisk.svg?style=social&logo=twitter)](https://twitter.com/intent/follow?screen_name=openwhisk)
 
 ### Give it a try today
 To use as a docker action