[helloworld] Add playbook

Signed-off-by: Yohann D'ANELLO <ynerant@crans.org>

plays/printer.yml

+#!/usr/bin/env ansible-playbook
+---
+- hosts: printer
+  vars:
+    printer: "{{ glob_printer | combine(loc_printer | default({}), recursive=True) }}"
+    nginx: "{{ glob_nginx | combine(loc_nginx | default({})) }}"
+  roles:
+    - printer
+    - nginx