update README

Author: snicker

README.md

@@ -14,6 +14,8 @@ Noonlight connects to emergency 9-1-1 services in all 50 U.S. states. Backed by
 
 When integrated with Home Assistant, a **Noonlight Alarm** switch will appear in your list of entities. When the Noonlight Alarm switch is turned _on_, this will send an emergency signal to Noonlight. You will be contacted by text and voice at the phone number associated with your Noonlight account. If you confirm the emergency with the Noonlight operator, or if you're unable to respond, Noonlight will dispatch local emergency services to your home using the [longitude and latitude coordinates](https://www.home-assistant.io/docs/configuration/basic/#latitude) specified in your Home Assistant configuration.
 
+Additionally, a new service will be exposed to Home Assistant: `noonlight.create_alarm`, which allows you to explicitly specify the type of emergency service required by the alarm: medical, fire, or police. By default, the switch entity assumes "police".
+
 **False alarm?** No problem. Just tell the Noonlight operator your PIN when you are contacted and the alarm will be canceled. We're glad you're safe!
 
 The _Noonlight Switch_ can be activated by any Home Assistant automation, just like any type of switch! [See examples below](#automation-examples).