Create ga-event-tracking.js

Category	String	Yes	Typically the object that was interacted with (e.g. button)
Action	String	Yes	The type of interaction (e.g. click)
Label	String	No	Useful for categorizing events (e.g. nav buttons)
Value	Number	No	Values must be non-negative. Useful to pass counts (e.g. 4 times)

https://developers.google.com/analytics/devguides/collection/analyticsjs/events#usingjquery