[CDTOOL-1214] Add example for fastly_domain_v1 resource (#1146)

append docs

Author: rcaril

docs/resources/domain_v1.md

@@ -1,16 +1,26 @@
 ---
-# generated by https://github.com/hashicorp/terraform-plugin-docs
-page_title: "fastly_domain_v1 Resource - terraform-provider-fastly"
-subcategory: ""
+layout: "fastly"
+page_title: "Fastly: fastly_domain_v1"
+sidebar_current: "docs-fastly-resource-domain"
 description: |-
-  
+  Manage your domains on Fastly.
 ---
 
-# fastly_domain_v1 (Resource)
+# fastly_domain_v1
 
+Domain management allows you to manage your domains on Fastly and the services that they interact with.
 
+## Example Usage
 
+Basic usage:
 
+```terraform
+resource "fastly_domain_v1" "example" {
+    fqdn = "example.com"
+    service_id = "12345abcde"
+    description = "This is a test domain."
+}
+```
 
 <!-- schema generated by tfplugindocs -->
 ## Schema

examples/resources/domain_v1_basic_usage.tf

@@ -0,0 +1,5 @@
+resource "fastly_domain_v1" "example" {
+    fqdn = "example.com"
+    service_id = "12345abcde"
+    description = "This is a test domain."
+}

templates/resources/domain_v1.md.tmpl

@@ -0,0 +1,19 @@
+---
+layout: "fastly"
+page_title: "Fastly: fastly_domain_v1"
+sidebar_current: "docs-fastly-resource-domain"
+description: |-
+  Manage your domains on Fastly.
+---
+
+# fastly_domain_v1
+
+Domain management allows you to manage your domains on Fastly and the services that they interact with.
+
+## Example Usage
+
+Basic usage:
+
+{{ tffile "examples/resources/domain_v1_basic_usage.tf" }}
+
+{{ .SchemaMarkdown | trimspace }}