Use --display-name in gcloud cli service account cmd.

- It is easier for users to identify the service account that they
created if they provide it a --display-name. It helps them differentiate
between this user and the opsman user (which has a display name).

README.md

@@ -32,7 +32,7 @@ You will need a key file for your [service account](https://cloud.google.com/iam
 to allow terraform to deploy resources. If you don't have one, you can create a service account and a key for it:
 
 ```bash
-gcloud iam service-accounts create some-account-name
+gcloud iam service-accounts create some-account-name --display-name "Some Account Name"
 gcloud iam service-accounts keys create "terraform.key.json" --iam-account "[email protected]"
 gcloud projects add-iam-policy-binding PROJECT_ID --member 'serviceAccount:some-account-name@PROJECT_ID.iam.gserviceaccount.com' --role 'roles/owner'
 ```