Add fjäråskupan documentation (#18542)

Co-authored-by: Klaas Schoute <klaas_schoute@hotmail.com>
Co-authored-by: Martin Hjelmare <marhje52@gmail.com>

source/_integrations/fjaraskupan.markdown

@@ -0,0 +1,41 @@
+---
+title: Fjäråskupan
+description: Instructions on how to configure fjäråskupan integration.
+ha_category:
+  - Binary Sensor
+  - Fan
+  - Light
+ha_release: 2021.9
+ha_iot_class: Local Push
+ha_config_flow: true
+ha_codeowners:
+  - '@elupus'
+ha_domain: fjaraskupan
+ha_platforms:
+  - binary_sensor
+  - fan
+  - light
+---
+
+[Fjäråskupan](https://fjaraskupan.se/) allows you to control your Bluetooth equipped kitchen fan.
+
+There is currently support for the following device types within Home Assistant:
+
+- Binary Sensor
+- Fan
+- Light
+
+The integration allow control of fan speeds, lights and after cooking timer for kitchen fans.
+
+{% include integrations/config_flow.md %}
+
+## Debugging integration
+
+If you have problems with the integration you can add debug prints to the log.
+
+```yaml
+logger:
+  default: info
+  logs:
+    homeassistant.components.fjaraskupan: debug
+```