Add Elk-M1 sensor platform documentation (#6705)

* Add Elk-M1 sensor platform documentation.

* Fix PR comment

* Bump version

* fix

source/_components/sensor.elkm1.markdown

@@ -0,0 +1,22 @@
+---
+layout: page
+title: "Elk-M1 Sensor"
+description: "Instructions on how to integrate Elk-M1 counters, keypads, panel, settings, and zones."
+date: 2018-10-11 00:00
+sidebar: true
+comments: false
+sharing: true
+footer: true
+logo: elkproducts.png
+ha_release: 0.81
+ha_category: Sensor
+ha_iot_class: "Local Push"
+---
+
+The `elkm1` platform allows you to control your [Elk-M1](https://www.elkproducts.com/m1_controls.html).
+
+Elk-M1 counters, keypads, panel, settings, and zones are represented as `sensor` entities.
+
+<p class='note'>
+Full configuration details can be found on the main [Elk-M1 component](/components/elkm1/) page.
+</p>