update github action md
You can integrate Checkov into Github Actions. This provides a simple, automatic way of applying policies to your Terraform code both during merge request review and as part of any build process.
-## Basic Set-up
+## Use a checkov action from the marketplace:
+go to https://github.com/bridgecrewio/checkov-action and use a pre-made action!
+
+## Create your own action: Basic Set-up
Add a new step in the `workflow.yml`.
