Add APRS device tracker documentation (#9056)

* Add APRS device tracker documentation

* Clarify timeout config

* Update release

* Update release

Hopefully this one is it.

* ✏️ Tweak

source/_components/device_tracker.aprs.markdown

@@ -0,0 +1,59 @@
+---
+layout: page
+title: "APRS"
+description: "Instructions on how to use APRS to track devices in Home Assistant."
+date: 2018-11-04 00:00
+sidebar: true
+comments: false
+sharing: true
+footer: true
+logo: aprs.png
+ha_release: 0.95
+ha_category: Presence Detection
+ha_iot_class: Cloud Push
+---
+
+The `aprs` [(Automatic Packet Reporting System)](https://en.wikipedia.org/wiki/Automatic_Packet_Reporting_System) device tracker component connects to the [APRS-IS](http://aprs-is.net/) network for tracking amateur radio devices.
+
+## {% linkable_title Configuration %}
+
+To enable APRS tracking in Home Assistant, add the following section to `configuration.yaml`:
+
+```yaml
+# Example configuration.yaml entry
+device_tracker:
+  - platform: aprs
+    username: FO0BAR
+    callsigns:
+      - 'XX0FOO*'
+      - 'YY0BAR-1'
+```
+
+{% configuration %}
+username:
+  description: Your callsign. This is used to connect to the host.
+  required: true
+  type: string
+password:
+  description: Your APRS password. This will verify the connection.
+  required: false
+  type: string
+  default: -1
+callsigns:
+  description: A list of callsigns you wish to track. Wildcard `*` is allowed. Any callsigns that match will be added as devices.
+  required: true
+  type: list
+host:
+  description: The APRS server to connect to.
+  required: false
+  type: string
+  default: rotate.aprs2.net
+timeout:
+  description: The number of seconds to wait to connect to the APRS-IS network before giving up.
+  required: false
+  type: float
+  default: 30.0
+{% endconfiguration %}
+
+Verified connections are only required to send data to the APRS-IS network, which the `aprs` platform does not yet do.
+However, you are free to verify your connection if you know your APRS password.