chore: Update README.md to include customer_managed_policies. (#16)

Author: ArjunDandagi

README.md

@@ -47,6 +47,7 @@ module "sso" {
 | session\_duration | (Optional) The length of time that the application user sessions are valid in the ISO-8601 standard | string | Provider default behavior. |
 | tags | (Optional) Key-value map of resource tags. | string | Provider default behavior |
 | managed\_policies | (Optional) List of Managed IAM policies that are attached to permission set. | list(string) | Managed Policies not set. |
+| customer\_managed\_policies | (Optional) List of Customer Managed IAM policies that are attached to permission set. | list(string) | Customer Managed Policies not set. |
 | inline\_policy | (Optional) Inline policy that is attached to permission set. | string | Inline policy not set. |
 
 `account_assignments` is a list of maps which have the following keys/value pairs.
@@ -103,4 +104,4 @@ No modules.
 |------|-------------|
 | <a name="output_aws_ssoadmin_account_assignments"></a> [aws\_ssoadmin\_account\_assignments](#output\_aws\_ssoadmin\_account\_assignments) | Maps of account assignments to permission sets with keys user/group\_name.permission\_set\_name.account\_id and attributes listed in Terraform resource aws\_ssoadmin\_account\_assignment documentation. |
 | <a name="output_aws_ssoadmin_permission_sets"></a> [aws\_ssoadmin\_permission\_sets](#output\_aws\_ssoadmin\_permission\_sets) | Maps of permission sets with attributes listed in Terraform resource aws\_ssoadmin\_permission\_set documentation. |
-<!-- END OF PRE-COMMIT-TERRAFORM DOCS HOOK -->
+<!-- END OF PRE-COMMIT-TERRAFORM DOCS HOOK -->