Bogdan Barna

## what Add `groups` variable and attachment, similar to [https://github.com/cloudposse/terraform-aws-iam-user](https://github.com/cloudposse/terraform-aws-iam-user/tree/f4b45df9d6c297d0b51acbaef0a70baa96b6ae9d). ## why System users can be grouped just like human users so that they benefit from common policies. ## references...