Added documentation for Ubee router device tracker (#7955)

* Added Documentation for Ubee Router Device Tracker.

* Added Documentation for Ubee Router Device Tracker (this time for real)

* Updated Ubee logo to be visible on white background and changed title

* Changed HA version to 0.87.

* Changed HA version to 0.88.

* Bumped to 0.89 version

* ✏️ Tweaks

source/_components/device_tracker.ubee.markdown

@@ -0,0 +1,44 @@
+---
+layout: page
+title: "Ubee Router"
+description: "Instructions on how to integrate Ubee routers into Home Assistant."
+date: 2018-12-26 18:00
+sidebar: true
+comments: false
+sharing: true
+footer: true
+logo: ubee.png
+ha_category: Presence Detection
+ha_release: 0.89
+---
+
+This platform offers presence detection by looking at connected devices to a [Ubee Router](http://www.ubeeinteractive.com/products).
+
+To use a Ubee router in your installation, add the following to your `configuration.yaml` file:
+
+```yaml
+# Example configuration.yaml entry
+device_tracker:
+  - platform: ubee
+    host: ROUTER_IP_ADDRESS
+    username: YOUR_ADMIN_USERNAME
+    password: YOUR_ADMIN_PASSWORD
+```
+
+{% configuration %}
+host:
+  description: The IP address of your router, e.g., `192.168.1.1`.
+  required: true
+  type: string
+username:
+  description: The username of a user with administrative privileges, usually `admin`.
+  required: true
+  type: string
+password:
+  description: The password for your given admin account.
+  required: true
+  type: string
+{% endconfiguration %}
+
+By default, Home Assistant pulls information about connected devices from Ubee router every 5 seconds.
+See the [device tracker component page](/components/device_tracker/) for instructions on how to configure the people to be tracked.