Add the ability to create groups

Change-Id: Ia3afd1751bf822a7efd706aa029dbed079e7c026
diff --git a/tasks/main.yml b/tasks/main.yml
index c0b2b39..befc0dc 100644
--- a/tasks/main.yml
+++ b/tasks/main.yml
@@ -10,6 +10,11 @@
 - name: include OS-specific tasks
   include_tasks: "{{ ansible_os_family }}.yml"
 
+- name: Create groups
+  group:
+    name: "{{ item }}"
+  with_items: "{{ users_groups }}"
+
 - name: Create user accounts
   user:
     name: "{{ item.username }}"