docs/provisioners/ansible: Add playbook to basic example. (#8508)

website/source/docs/provisioners/ansible.html.md.erb

@@ -25,6 +25,7 @@ provisioner.
 This is a fully functional template that will provision an image on
 DigitalOcean. Replace the mock `api_token` value with your own.
 
+Example Packer template:
 ``` json
 {
   "provisioners": [
@@ -45,6 +46,23 @@ DigitalOcean. Replace the mock `api_token` value with your own.
 }
 ```
 
+Example playbook:
+
+```
+---
+# playbook.yml
+- name: "Provision Image"
+  hosts: default
+  become: true
+
+  tasks:
+  - name: install Apache
+    package:
+      name: "httpd"
+      state: present
+
+```
+
 ## Configuration Reference
 
 Required Parameters:
@@ -451,4 +469,4 @@ Example playbook:
     - name: install Apache
       yum:
         name: httpd
-```
+```