add a status badge to the readme

README.md

@@ -1,5 +1,7 @@
 # Probot: Reminders
 
+[![Node.js CI](https://github.com/probot/reminders/actions/workflows/npm-test.js.yml/badge.svg)](https://github.com/probot/reminders/actions/workflows/npm-test.js.yml)
+
 > a GitHub App built with [Probot](https://github.com/probot/probot) that adds reminders to Issues and Pull Requests.
 
 Use the `/remind` slash command to set a reminder on any comment box on GitHub and you'll get a ping about it again when the reminder is due.
@@ -13,12 +15,12 @@ Use the `/remind` slash command to set a reminder on any comment box on GitHub a
 
 ## Setup
 
-```
+```bash
 # Install dependencies
 npm install
 
 # Run the bot
 npm start
 ```
 
-For more information, see the [documentation for probot](https://github.com/probot/probot).
+For more information, see the [documentation for probot](https://github.com/probot/probot).