UniFi POE control (#6826)

* Documentation for UniFi component

* Clarification of relationship with device tracker implementation

source/_components/switch.unifi.markdown

@@ -0,0 +1,20 @@
+---
+layout: page
+title: "UniFi Switches"
+description: "Instructions on how to integrate POE control switches from UniFi into Home Assistant."
+date: 2018-10-15 22:00
+sidebar: true
+comments: false
+sharing: true
+footer: true
+logo: ubiquiti.png
+ha_category: Switch
+ha_release: "0.81"
+ha_iot_class: "Local Polling"
+---
+
+See the [UniFi main component](/components/unifi/) for configuration instructions.
+
+Switches are network devices that are powered by POE switches from Ubuiqitis UniFi line of networking gear.
+
+Note that POE control actually configures the network port of the switch which the device is connected to.

source/_components/unifi.markdown

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+---
+layout: page
+title: "UniFi"
+description: "Instructions on how to configure UniFi integration with UniFi Controller by Ubiquiti."
+date: 2018-10-15 22:00
+sidebar: true
+comments: false
+sharing: true
+footer: true
+logo: ubiuiti.png
+ha_category: Hub
+ha_release: "0.81"
+ha_iot_class: "Local Polling"
+---
+
+[UniFi](https://unifi-sdn.ubnt.com/) by [Ubiquiti Networks, inc.](https://www.ubnt.com/) is a software that binds gateways, switches and wireless access points together with one graphical front end.
+
+Currently this implementation only exposes POE control for networked devices. Device tracker implementation is not using the same code base.
+
+## {% linkable_title Configuration %}
+
+Home Assistant offers UniFi integration through **Configuration** -> **Integrations** -> **UniFi Controller**.
+
+Enter `host address`, `user name` and `password` and then continue to select which `site` you want to connect to Home Assistant. The user must have administrator privileges.
+
+## {% linkable_title Debugging component %}
+
+If you have problems with UniFi or the component you can add debug prints to the log.
+
+```yaml
+logger:
+  default: info
+  logs:
+    aiounifi: debug
+    homeassistant.components.unifi: debug
+    homeassistant.components.switch.unifi: debug
+```