Documentation for new Transport NSW sensor (#6529)

* Documentation for new Transport NSW sensor

* Update sensor.transport_nsw.markdown

* ✏️ Tweak

* 🔥 Removes duplicate header

* Fixes of variable names due to code change

* Logo update

* ⬆️ ha_release

source/_components/sensor.transport_nsw.markdown

@@ -0,0 +1,54 @@
+---
+layout: page
+title: "Transport NSW"
+description: "Instructions on how to integrate timetable data for Transport NSW (Australia) within Home Assistant."
+date: 2018-10-05 00:00
+sidebar: true
+comments: false
+sharing: true
+footer: true
+logo: transport_nsw.png
+ha_category: Transport
+ha_iot_class: "Cloud Polling"
+ha_release: 0.81
+---
+
+
+The `transport_nsw` sensor will give you the time until the next departure from a Transport NSW stop (bus, train or ferry).
+
+Get your free API key from [Transport NSW](https://opendata.transport.nsw.gov.au/).
+
+In order to find the stop id, just go to Google maps and click on the bus/train/ferry stop. It will give you there the stop ID.
+
+You can define a bus line, but if you don’t do it, the sensor will pick up the next stop event from any line servicing this stop.
+
+Then add the data to your `configuration.yaml` file as shown in the example:
+
+```yaml
+# Example configuration.yaml entry
+sensor:
+  - platform: transport_nsw
+    stop_id: '200024'
+    api_key: 'YOUR API KEY'
+```
+
+{% configuration %}
+api_key:
+  description: Your API key for Open Data Transport NSW
+  required: true
+  type: string
+stop_id:
+  description: The ID of the stop to get the information for
+  required: true
+  type: string
+route:
+  description: Only show a single bus route at the stop. This is the same as the bus number, e.g., `83`
+  required: false
+  type: string
+name:
+  description: A friendly name for this sensor.
+  required: false
+  type: string
+{% endconfiguration %}
+
+The public information is coming from [Transport NSW](https://opendata.transport.nsw.gov.au/).