Add ubiquiti docs

source/_components/sensor.mfi.markdown

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+---
+layout: component
+title: "mFi Sensor"
+description: "Instructions how to integrate mFi sensors within Home Assistant."
+date: 2016-02-07 10:00
+sidebar: true
+comments: false
+sharing: true
+footer: true
+logo: ubiquiti.png
+ha_category: Sensor
+---
+
+
+The `mfi` sensor platform to allow you to monitor [mFi mPort interface and sensors](https://www.ubnt.com/mfi/mport/).
+
+To add this platform to your installation, add the following to your `configuration.yaml` file:
+
+```yaml
+# Example configuration.yaml entry
+sensor:
+  platform: mfi
+  host: IP_ADDRESS
+  port: PORT
+  username: USERNAME
+  password: PASSWORD
+```
+
+Configuration variables:
+
+- **host** (*Required*): The IP address or hostname of your mFi controller.
+- **port** (*Optional*): The port of your mFi controller. Defaults to 6443.
+- **username** (*Required*): The mFi admin username.
+- **password** (*Required*): The mFi admin user's password.
+