bash: gatling:test: command not found

I am setting up Scala and Gatling first time on new laptop, I downloaded a GitHub - gatling/gatling-maven-plugin-demo: Showcase of the Gatling Plugin for Maven to test and I get bash: gatling:test: command not found: attached screenshot.

Please let me know if any pre configurations are needed? (I added Scala Plugin in IntelliJ) do we need to set any environment variables?

( In my production also I have issues, but I tried a sample app above so I know if there are setup issues)

Please let me know.