add some config options

README.md

@@ -8,4 +8,11 @@ This script requires an ini-style config file named `config.conf` for icinga bas
 baseurl = https://example.org:5665
 username = root
 password = foobar
+
+[filters]
+services = "checks_with_sms" in service.groups
+hosts = "checks_with_sms" in host.groups
+
+[output]
+filename = index.html
 ```