Add nextbus (#8661)

* Add initial NextBus documentation

* Update nextbus docs to meet standards

* Update ha_releaes

Setting it to the next relese

* Update nextbus docs to describe how to get config values

* Add sensor to ha_category

Co-Authored-By: ViViDboarder <ViViDboarder@gmail.com>

* ✏️ Tweak

After this we will merge it

* ✏️ Change file name

source/_components/nextbus.markdown

@@ -0,0 +1,58 @@
+---
+layout: page
+title: "Public Transit (Nextbus)"
+description: "Instructions on how to use public transit data from Nextbus in Home Assistant."
+date: 2019-02-20 00:00
+sidebar: true
+comments: false
+sharing: true
+footer: true
+logo: train.png
+ha_category:
+  - Transport
+  - Sensor
+ha_iot_class: Local Polling
+ha_release: 0.93
+---
+
+The `nextbus` sensor will give you the next departure time and associated data from your public transit station/stop. The data comes from [NextBus](https://www.nextbus.com), which provides real time transit data for a number of transit authorities.
+
+It is possible to get the tag information from the NextBus website.
+
+  1. Visit https://www.nextbus.com/
+  2. Use the drop downs to select the transit system, route, direction, and stop
+  3. Extract the tags from the URL. It is constructed with the following pattern:
+
+    https://www.nextbus.com/#!/<agency>/<route>/<direction>/<stop>
+
+If tags are incorrect, valid ones will be displayed in the logs as a
+convenience.
+
+```yaml
+# Example configuration.yaml entry
+sensor:
+  - platform: nextbus
+    agency: AGENCY_TAG
+    route: ROUTE_TAG
+    stop: STOP_TAG
+```
+
+{% configuration %}
+agency:
+  description: The agency tag from NextBus.
+  required: true
+  type: string
+route:
+  description: The route tag from NextBus.
+  required: true
+  type: string
+stop:
+  description: The stop tag from NextBus.
+  required: true
+  type: integer
+name:
+  description: Name to use in the frontend.
+  required: false
+  default: <Agency> - <Route>
+  type: string
+{% endconfiguration %}