Add docs for Avion dimmer switches (#1811)

source/_components/light.avion.markdown

@@ -0,0 +1,39 @@
+---
+layout: page
+title: "Avion"
+description: "Instructions on how to setup GE Avion Bluetooth dimmers within Home Assistant."
+date: 2017-01-17 23:17
+sidebar: true
+comments: false
+sharing: true
+footer: true
+ha_category: Light
+ha_iot_class: "Assumed State"
+featured: false
+ha_release: 0.37
+---
+
+Support for the Avion Bluetooth dimmer switch [Avi-On](http://avi-on.com/). To enable these lights, add the following lines to your `configuration.yaml` file:
+
+```yaml
+# Example configuration.yaml entry
+light:
+  - platform: avion
+    devices:
+      00:21:4D:00:00:01:
+        name: Light 1
+        api_key: Gr35a/rt3RgaRenl9ag8Ba==
+      00:21:3D:20:00:a1:
+        name: Bulb 2
+        api_key: Gr35a/rt3RgaRenl9ag8Ba==
+```
+
+Configuration variables:
+
+- **devices**: A list of devices with their bluetooth address, a custom name to use in the frontend and the API key. The API key can be obtained by executing the following command:
+
+```
+curl -X POST -H "Content-Type: application/json" -d '{"email": "fakename@example.com", "password": "password"}' https://admin.avi-on.com/api/sessions | jq
+```
+
+with the email and password fields replaced with those used when registering the device via the mobile app. The passphrase field of the output should be used as the API key in the configuration.