Mark 'account_id' and 'assume_role_arn' as optional

'account_id' is deprecated because it was only used to add the 'assume_role_arn'!

Now it is possible to use 'assume_role_arn' directly but it is optional

Apply naming convention consitently

Merge pull request #2 from solutionDrive/add-terraform-module

[hotfix] fixed name of resource to refelct ipv4

Initial Release

Merge pull request #1 from solutionDrive/add-terraform-module

added existing module and updated the README.md so no internal stuff …