add doc file that I forgot

website/source/docs/providers/aws/r/iam_group_membership.html.markdown

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+---
+layout: "aws"
+page_title: "AWS: aws_iam_role"
+sidebar_current: "docs-aws-resource-iam-group-membership"
+description: |-
+  Provides an IAM role.
+---
+
+# aws\_iam\_group\_membership
+
+Provides a top level resource to manage IAM Group membership for IAM Users. For
+more information on managing IAM Groups or IAM Users, see [IAM Groups][1] or
+[IAM Users][2]
+
+## Example Usage
+
+```
+resource "aws_iam_group_membership" "team" {
+	name = "tf-testing-group-membership"
+	users = [
+		"${aws_iam_user.user_one.name}",
+		"${aws_iam_user.user_two.name}",
+	]
+	group = "${aws_iam_group.group.name}"
+}
+
+resource "aws_iam_group" "group" {
+	name = "test-group"
+}
+
+resource "aws_iam_user" "user_one" {
+	name = "test-user"
+}
+
+resource "aws_iam_user" "user_two" {
+	name = "test-user-two"
+}
+```
+
+## Argument Reference
+
+The following arguments are supported:
+
+* `name` - (Required) The name to identify the Group Membership
+* `users` - (Required) A list of IAM User names to associate with the Group
+* `group` – (Required) The IAM Group name to attach the list of `users` to
+
+## Attributes Reference
+
+* `name` - The name to identifing the Group Membership
+* `users` - list of IAM User names 
+* `group` – IAM Group name 
+
+
+[1]: /docs/providers/aws/r/iam_group.html
+[2]: /docs/providers/aws/r/iam_user.html