add status badge (#125)

README.md

@@ -12,6 +12,7 @@ A heads-up display into your Pantheon environment.
 ## Description ##
 
 [![CircleCI](https://dl.circleci.com/status-badge/img/gh/pantheon-systems/pantheon-hud/tree/master.svg?style=svg)](https://dl.circleci.com/status-badge/redirect/gh/pantheon-systems/pantheon-hud/tree/master)
+[![Lint & Test](https://github.com/pantheon-systems/pantheon-hud/actions/workflows/lint-test.yml/badge.svg)](https://github.com/pantheon-systems/pantheon-hud/actions/workflows/lint-test.yml)
 [![Actively Maintained](https://img.shields.io/badge/Pantheon-Actively_Maintained-yellow?logo=pantheon&color=FFDC28)](https://docs.pantheon.io/oss-support-levels#actively-maintained-support)
 
 This plugin provides situational awareness of the Pantheon plaform from within your WordPress dashboard. It's helpful to be reminded what environment you're in, as well as providing quick links to get back to Pantheon's dashboard, or to interface with your WordPress installation via the command line.