Add iAlarm integration (#15718)

Co-authored-by: Franck Nijhof <frenck@frenck.nl>

source/_integrations/ialarm.markdown

@@ -0,0 +1,23 @@
+---
+title: "Antifurto365 iAlarm"
+description: "Instructions on how to integrate iAlarms alarms into Home Assistant."
+logo: antifurto365-ialarm.png
+ha_category:
+  - Alarm
+ha_iot_class: Local Polling
+ha_config_flow: true
+ha_release: "2021.5"
+ha_domain: ialarm
+ha_codeowners:
+  - '@RyuzakiKK'
+---
+
+The iAlarm integration provides connectivity with the [Antifurto365](https://www.antifurtocasa365.it/) iAlarm alarm systems and has also been confirmed to work with the alarm system brands Meian and Emooluxr.
+
+This platform supports the following services:
+
+- `alarm_control_panel.alarm_arm_away`
+- `alarm_control_panel.alarm_arm_home`
+- `alarm_control_panel.alarm_disarm`
+
+{% include integrations/config_flow.md %}