New variables: create_parameter_group and parameter_group_name (#208)

* new variable: parameter_group_name

* new variable: create_parameter_group

* update README

* remove comment

* Update parameter group description

Co-authored-by: Andriy Knysh <[email protected]>

* change module.this.enabled to local.enabled

* replace . with -

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Co-authored-by: Andriy Knysh <[email protected]>

Author: y3ti