Add RitAssist support page (#5549)

* RitAssist documentation added

Added RitAssist device tracker documentation.

* Add RitAssist logo image

* ✏️ Minor tweaks

* ⬆️ Upped ha_release to 0.73

* Added FleetGO.com and attribute descriptions

* ⬆️ ha_release to 0.74

* Add ha_iot_class and update version

source/_components/device_tracker.ritassist.markdown

@@ -0,0 +1,82 @@
+---
+layout: page
+title: "RitAssist"
+description: "Instructions on how to use a RitAssist as a device tracker."
+date: 2018-06-15 22:00
+sidebar: true
+comments: false
+sharing: true
+footer: true
+logo: ritassist.png
+ha_category: Presence Detection
+ha_iot_class: Cloud Polling
+ha_release: 0.76
+---
+
+This platform allows you to integrate your vehicles equipped with [RitAssist](https://ritassist.nl/) or [FleetGO](https://fleetgo.com) hardware into Home Assistant. It allows you to see certain details about your vehicle, but also shows your vehicle on the map.
+
+## API key
+To use this component, you need an **API key** and **API secret**, which can be requested by contacting [info@fleetgo.com](mailto:info@fleetgo.com?subject=API%20Key).
+
+## Configuration
+To use this device tracker in your installation, add the following to your `configuration.yaml` file:
+
+```yaml
+# Example configuration.yaml entry
+device_tracker:
+  - platform: ritassist
+    client_id: YOUR_CLIENT_ID
+    client_secret: YOUR_CLIENT_SECRET
+    username: YOUR_RITASSIST_USERNAME
+    password: YOUR_RITASSIST_PASSWORD
+    include:
+        - LICENSE_PLATE
+```
+
+{% configuration %}
+client_id:
+  description: The client ID used to connect to the RitAssist API.
+  required: true
+  type: string
+client_secret:
+  description: The client secret used to connect to the RitAssist API.
+  required: true
+  type: string
+username:
+  description: Your RitAssist username.
+  required: true
+  type: string
+password:
+  description: Your RitAssist password.
+  required: true
+  type: string
+include:
+  description: A list of license plates to include, if this is not specified, all vehicles will be added.
+  required: false
+  type: strings
+{% endconfiguration %}
+
+See the [device tracker component page](/components/device_tracker/) for instructions on how to configure the people to be tracked.
+
+## Available Attributes
+
+| Attribute | Description |
+|---|---|
+| latitude | The latitude of your vehicle |
+| longitude | The longitude of your vehicle |
+| altitude | Altitude of your vehicle |
+| id | Identifier used to identify your vehicle |
+| make | The make of the vehicle |
+| model | Model of your vehicle |
+| license_plate | License plate number |
+| active | If the engine is currently active or not |
+| odo | The odometer in kilometers |
+| speed | The current speed of your vehicle, in KM/h |
+| last_seen | The date and time when your vehicle last communicated with the API |
+| fuel_level | Fuel level of the vehicle [1] |
+| malfunction_light | Are any malfunction lights burning [1] |
+| coolant_temperature | Temperature of the coolant [1] |
+| power_voltage | Power voltage measured by the hardware [1] |
+| distance_from_home |  How far is your vehicle located from your Home Assistant Home location |
+
+[1] Only available on certain cars and hardware revisions.