Adding support for Read Replicas creation #104
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Changes to fix issue #103
Added a new module to create Read Replicas in the same region or in a different one based on a new variable Is_replica (default value is false).
The problem in the current version is that the terraform resource aws_db_instance is always created with username and password variables. However, for read replicas username and password should not be used (https://www.terraform.io/docs/providers/aws/r/db_instance.html):