add readme

.pre-commit-config.yaml

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+- repo: git://github.com/antonbabenko/pre-commit-terraform
+  rev: v1.19.0
+  hooks:
+    - id: terraform_fmt
+    - id: terraform_docs
+

README.md

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+## Terraform AWS DocumentDB Cluster
+
+This terraform module creates a documentDB cluster.
+
+<!-- BEGINNING OF PRE-COMMIT-TERRAFORM DOCS HOOK -->
+## Inputs
+
+| Name | Description | Type | Default | Required |
+|------|-------------|:----:|:-----:|:-----:|
+| backup\_retention\_period |  | number | `"7"` | no |
+| cluster\_instance\_class |  | string | `"db.r5.large"` | no |
+| cluster\_instance\_count |  | number | `"1"` | no |
+| cluster\_security\_group |  | list(string) | n/a | yes |
+| group\_subnets |  | list(string) | `[]` | no |
+| master\_password |  | string | n/a | yes |
+| master\_username |  | string | n/a | yes |
+| name |  | string | n/a | yes |
+| parameters | additional parameters modified in parameter group | list(map(any)) | `[]` | no |
+| preferred\_backup\_window |  | string | `"07:00-09:00"` | no |
+| skip\_final\_snapshot |  | bool | `"false"` | no |
+| storage\_encrypted |  | bool | `"true"` | no |
+
+## Outputs
+
+| Name | Description |
+|------|-------------|
+| arn |  |
+| cluster\_members |  |
+| cluster\_resource\_id |  |
+| endpoint |  |
+| hosted\_zone\_id |  |
+| id |  |
+| reader\_endpoint |  |
+
+<!-- END OF PRE-COMMIT-TERRAFORM DOCS HOOK -->