add video to readme

Author: kylewelsby

Diff for: README.md

@@ -16,6 +16,10 @@ Once installed, the plugin will automatically push the supported events to Segme
 
 # Installation
 
+<iframe width="420" height="315" src="https://www.youtube.com/embed/AKR3ki9Kj38" frameborder="0" allowfullscreen></iframe>
+
+In segment.io you will need a `ruby` source to receive the incoming events.
+
 To install using docker, add the following to your `app.yml` in the plugins section:
 
     env: