Add example playbook for azure role

Added an example playbook demonstrating how to use the azure role.

Author: mcappadonna

azure.yml

@@ -0,0 +1,51 @@
+---
+
+- hosts: all
+  become: true
+  # Gathering facts must be disable on the playbook and run manually after the
+  # VMs was powered on. This to avoid marking the VM immediately as "not
+  # reachable" and skipped in all other tasks.
+  gather_facts: false
+
+  tasks:
+    # This task must be run only once, and the role will perform its tasks on
+    # localhost, so we can run the power on tasks also on an inventory of
+    # powered off VMs
+    - name: "Power on Azure VMs"
+      include_role:
+        name: azure
+        tasks_from: power
+      vars:
+        vm_list: "{{ groups['base'] }}"
+        status: on
+      when:
+        - azure_vm_keep_running is defined
+      run_once: true
+
+    # After the VMs was powered on, we can gather facts from hosts
+    - name: "Gathering host facts"
+      gather_facts:
+
+    # Here we start the "normal" playbook operations
+    - name: "Import base variables"
+      include_vars: base.yaml
+
+    - import_role:
+        name: my-first-role
+
+    - import_role:
+        name: my-second-role
+
+    # Then we can proceed to power off all the VMs. This task also need to be
+    # run only once, and it will performed on localhost
+
+    - name: "Power off Azure VMs"
+      include_role:
+        name: azure
+        tasks_from: power
+      vars:
+        vm_list: "{{ groups['base'] }}"
+        status: off
+      when:
+        - azure_vm_keep_running is defined
+      run_once: true