readme: Update add-on's readme

addons/external-dns/README.md

@@ -18,4 +18,50 @@ module "addons" {
 
   external_dns = true
 }
-```
+```
+<!-- BEGINNING OF PRE-COMMIT-TERRAFORM DOCS HOOK -->
+## Requirements
+
+| Name | Version |
+|------|---------|
+| <a name="requirement_terraform"></a> [terraform](#requirement\_terraform) | >= 1.0.0 |
+| <a name="requirement_google"></a> [google](#requirement\_google) | >= 5.10.0 |
+| <a name="requirement_kubernetes"></a> [kubernetes](#requirement\_kubernetes) | >= 2.10 |
+
+## Providers
+
+| Name | Version |
+|------|---------|
+| <a name="provider_google"></a> [google](#provider\_google) | >= 5.10.0 |
+| <a name="provider_kubernetes"></a> [kubernetes](#provider\_kubernetes) | >= 2.10 |
+
+## Modules
+
+| Name | Source | Version |
+|------|--------|---------|
+| <a name="module_helm_addon"></a> [helm\_addon](#module\_helm\_addon) | ../helm | n/a |
+
+## Resources
+
+| Name | Type |
+|------|------|
+| [google_project_iam_member.member-role](https://registry.terraform.io/providers/hashicorp/google/latest/docs/resources/project_iam_member) | resource |
+| [google_service_account_key.external_dns_key](https://registry.terraform.io/providers/hashicorp/google/latest/docs/resources/service_account_key) | resource |
+| [kubernetes_secret.external_dns_secret](https://registry.terraform.io/providers/hashicorp/kubernetes/latest/docs/resources/secret) | resource |
+
+## Inputs
+
+| Name | Description | Type | Default | Required |
+|------|-------------|------|---------|:--------:|
+| <a name="input_external_dns_extra_configs"></a> [external\_dns\_extra\_configs](#input\_external\_dns\_extra\_configs) | Override attributes of helm\_release terraform resource | `any` | `{}` | no |
+| <a name="input_helm_config"></a> [helm\_config](#input\_helm\_config) | Helm provider config for Cluster Autoscaler | `any` | `{}` | no |
+| <a name="input_project_id"></a> [project\_id](#input\_project\_id) | GCP project ID | `string` | n/a | yes |
+
+## Outputs
+
+| Name | Description |
+|------|-------------|
+| <a name="output_chart_version"></a> [chart\_version](#output\_chart\_version) | n/a |
+| <a name="output_namespace"></a> [namespace](#output\_namespace) | n/a |
+| <a name="output_repository"></a> [repository](#output\_repository) | n/a |
+<!-- END OF PRE-COMMIT-TERRAFORM DOCS HOOK -->