Initial documentation for new EverLights light component (#8076)

* Everlights light component documentation.

* Review feedback and fix typo.

* Add EverLights logo. Image copyright EverLights. Use on this page approved via email.

* English...

* ✏️ Tweaks

* ✏️ Tweaks

source/_components/light.everlights.markdown

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+---
+layout: page
+title: "EverLights Light"
+description: "Instructions on how to set up EverLights within Home Assistant."
+date: 2018-12-29
+sidebar: true
+comments: false
+sharing: true
+footer: true
+logo: everlights.png
+ha_category: Light
+ha_iot_class: "Local Polling"
+ha_release: 0.87
+---
+
+[EverLights](https://myeverlights.com/) are permanent Christmas lights installed on a home's gutters or flashing. This integration can change all LEDs in a zone to a single color or activate a pattern that was previously saved to the control box.
+
+### {% linkable_title Configuration Details %}
+
+To enable EverLights, add the following lines to your `configuration.yaml` file:
+
+```yaml
+# Example configuration.yaml entry
+light:
+  - platform: everlights
+    hosts:
+      - 192.168.1.123
+      - 192.168.1.124
+```
+
+{% configuration %}
+hosts:
+  description: EverLights control box IP addresses.
+  required: true
+  type: list
+{% endconfiguration %}
+
+### {% linkable_title Effects %}
+
+EverLights patterns saved to the control box can be activated using the effect parameter to the `light.turn_on` service. If an effect is specified, then the color and brightness are ignored.
+
+### Limitations
+
+The EverLights control box status indicates if a zone is active but does not indicate the current color or pattern. The color and effect in the state attributes are based on the last execution of `light.turn_on`. If the control box scheduler or another app makes a change, then the state attributes are not updated.