Create coding in custom app

I created another custom app with this “tutorial”:

https://github.com/Shopify/shopify-app-template-node/blob/cli_three/README.md

So with typing “npm init @Shopify_77 [email removed] in my Terminal.

After, I used “npm run dev”

Now, I have the path I mentioned above. But I can’t find any “SHOPIFY_API_KEY” of the app as described.

It’s frustrating ;(