added example playbook

playbook/README.md

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+# Example Playbook
+
+To run the playbook:
+    $ ansible-playbook playbook/example.yml
+
+It will deploy an apache web server on the localhost

playbook/playbook.yml

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+---
+
+- hosts: localhost
+
+  vars:
+    apache_remove_default_vhost: yes
+
+  roles:
+    - role: apache