Allow pre-populating the default AWX superuser account

installer/inventory

@@ -2,6 +2,11 @@ localhost ansible_connection=local ansible_python_interpreter="/usr/bin/env pyth
 
 [all:vars]
 
+# This will create or update a default admin (superuser) account in AWX, if not provided
+# then these default values are used
+# default_admin_user=admin
+# default_admin_password=password
+
 # Use a local distribution build container image for building the AWX package
 # This is helpful if you don't want to bother installing the build-time dependencies as
 # it is taken care of already.