Added example to using the playbook

playbooks/site.yml

@@ -1,5 +1,9 @@
 ---
 # This playbook deploys a development machine
+# EXAMPLE:
+# ansible-playbook -i ${project_dir}/hosts ${project_dir}/playbooks/site.yml \
+# -extra-vars "home_pub_key=<pub-key-location-to-curl> standard_user=<user_name> git_user=<git-user> git_email=<git-email>"
+
 
 - name: Apply common configuration to all nodes
   hosts: all