Add nx584 docs

source/_components/alarm_control_panel.nx584.markdown

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+---
+layout: component
+title: "NX584 Alarm Control Panel"
+description: "Instructions how to integrate NX584 into Home Assistant."
+date: 2016-02-07 10:00
+sidebar: true
+comments: false
+sharing: true
+footer: true
+ha_category: Alarm
+---
+
+The `nx584` platform is consuming the information provided by a [Alarm.com](https://www.alarm.com/).
+
+To enable this, add the following lines to your `configuration.yaml`:
+
+```yaml
+# Example configuration.yaml entry
+alarm_control_panel:
+  platform: nx584
+  host: IP_ADDRESS
+```
+
+Configuration variables:
+
+- **host** (*Optional*): The IP address of the pynx584 backend server. Defaults to `localhost:5007`.
+