Add docs for Brottsplatskartan sensor (#7731)

* Add docs for Brottsplatskartan sensor

* Update ha_version to 0.85

* Not implementing custom firing of event

source/_components/sensor.brottsplatskartan.markdown

@@ -0,0 +1,56 @@
+---
+layout: page
+title: "Brottsplatskartan"
+description: "Instructions on how to integrate brottsplatskartan.se into Home Assistant."
+date: 2018-12-02 20:00
+sidebar: true
+comments: false
+sharing: true
+footer: true
+ha_category: Social
+logo: brottsplatskartan.png
+ha_release: 0.85
+ha_iot_class: "Cloud Polling"
+---
+
+The `brottsplatskartan` sensor allows one to track reported incidents occurring in a given area. Incidents include anything reported to [Brottsplatskartan](https://brottsplatskartan.se). The sensor only counts incidents from the current day.
+
+## {% linkable_title Configuration %}
+
+To enable this sensor, add the following lines to your `configuration.yaml`.
+
+```yaml
+sensor:
+  - platform: brottsplatskartan
+```
+
+{% configuration %}
+name:
+  description: Custom name for the sensor.
+  required: false
+  type: string
+  default: Brottsplatskartan
+area:
+  description: Area for sensor to monitor
+  required: false
+  type: string
+latitude:
+  description: Latitude for sensor.
+  required: false
+  default: Your home zone latitude defined in your configuration.
+longitude:
+  description: Longitude for sensor.
+  required: false
+  default: Your home zone longitude defined in your configuration.
+{% endconfiguration %}
+
+
+## {% linkable_title Notes %}
+
+### {% linkable_title Area %}
+
+Brottsplatskartan captures all incidents in a region, e.g Stockholms län. If area parameter is defined, any latitude and longitude parameters are ignored.
+
+### {% linkable_title Latitude and Longitude %}
+
+The radius is set to 5 km when using latitude and longitude to monitor an area. It's not possible to explicitly set radius to another value.