basic readme for rule parser nested module

modules/rules_parser/README.md

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+<!-- BEGIN_TF_DOCS -->
+## Requirements
+
+No requirements.
+
+## Providers
+
+No providers.
+
+## Modules
+
+No modules.
+
+## Resources
+
+No resources.
+
+## Inputs
+
+| Name | Description | Type | Default | Required |
+|------|-------------|------|---------|:--------:|
+| <a name="input_rules"></a> [rules](#input\_rules) | List of rules. Each entry should be a single rule declaration | `list(string)` | n/a | yes |
+
+## Outputs
+
+| Name | Description |
+|------|-------------|
+| <a name="output_comments"></a> [comments](#output\_comments) | List of comments |
+| <a name="output_disabled"></a> [disabled](#output\_disabled) | List of disabled rules |
+| <a name="output_duplicate_sids"></a> [duplicate\_sids](#output\_duplicate\_sids) | List of duplicate statement identifiers for enabled rules |
+| <a name="output_enabled"></a> [enabled](#output\_enabled) | List of enabled rules |
+| <a name="output_generated"></a> [generated](#output\_generated) | n/a |
+| <a name="output_invalid"></a> [invalid](#output\_invalid) | List of rules that failed to be parsed |
+<!-- END_TF_DOCS -->