It's currently work in progress and meant for making developer lives easier
Just run it and follow on-screen instructions to configure your App ID instances.
You will need to provide platform API key with permissions to list,create and update your App ID instances. https://cloud.ibm.com/docs/iam?topic=iam-userapikey#create_user_key
npx app-id-cli
will start the wizard. Follow on-screen instructions.
npm install --global app-id-cli
app-id-cli