Example:
$ export ARM_TENANT_ID=<TENANT_ID>
$ export ARM_CLIENT_ID=<CLIENT_ID>
$ export ARM_CLIENT_SECRET=<CLIENT_SECRET>
$ terraformer import azuread --resources=user,application
List of supported AzureAD services:
userazuread_user
groupazuread_group
applicationazuread_application
service_principalazuread_service_principal
app_role_assignmentazuread_app_role_assignment