added new variables

README.md

@@ -21,6 +21,9 @@ on the same host and a mysql database.
 * **librenms_tls** - default value: yes
 * **librenms_http_port** - default value: 443
 * **librenms_version** - default value: master
+* **librenms_admin_user** - default value: admin
+* **librenms_admin_pass** - default value:: admin
+
 * **librenms_deb_packages** - list of packages, go check defaults/main.yml
 
 ## Example playbook