add readme

rds-mssql/README.md

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+# About
+
+This describes how to use the aws-common-security-groups submodule for rds-mssql
+
+# Usage
+
+```code
+module "rds-mssql" {
+  source = "git::https://vc1.csvd.census.gov/terraform-modules/aws-common-security-groups.git//rds-mssql"
+
+  # name = "m-rds-mssql"
+  vpc_id = var.vpc_id
+  vpc_full_name = "vpc1-services"
+  # Name, CostAllocation, and Environment are pre-set
+  # tags = { }
+}
+```
+
+## Requirements
+
+| Name | Version |
+|------|---------|
+| terraform | >= 0.12 |
+
+## Providers
+
+| Name | Version |
+|------|---------|
+| aws | n/a |
+
+## Inputs
+
+| Name | Description | Type | Default | Required |
+|------|-------------|------|---------|:--------:|
+| name | Security group Name | `string` | `"m-rds-mssql"` | no |
+| tags | Extra security group tags | `map` | <pre>{<br>  "CostAllocation": "csvd:infrastructure",<br>  "Environment": "csvd-infrastructure"<br>}</pre> | no |
+| vpc\_full\_name | VPC full name | `string` | `""` | no |
+| vpc\_id | VPC ID Number | `string` | n/a | yes |
+
+## Outputs
+
+| Name | Description |
+|------|-------------|
+| this\_security\_group\_arn | Created security group ARN |
+| this\_security\_group\_id | Created security group ID |