Add Airly documentation

source/_components/airly.markdown

@@ -0,0 +1,37 @@
+---
+title: "Airly"
+description: "Instructions on how to integrate Airly within Home Assistant."
+logo: airly.png
+ha_category:
+  - Health
+ha_release: 0.101
+ha_iot_class: Cloud Polling
+---
+
+The `airly` integration uses the [Airly](https://airly.eu/) web service as a source for air quality data for your location. To generate an Airly API key, go to [Airly for developers](https://developer.airly.eu/register) page.
+
+## Configuration
+
+To add Airly to your installation, go to **Configuration** >> **Integrations** in the UI and enable the Airly integration. By default, the values will be taken from the Home Assistant configuration.
+
+{% configuration %}
+name:
+  description: Manually specify Name.
+  required: false
+  type: string
+  default: Airly
+latitude:
+  description: Manually specify latitude.
+  required: false
+  type: float
+  default: Provided by Home Assistant configuration
+longitude:
+  description: Manually specify longitude.
+  required: false
+  type: float
+  default: Provided by Home Assistant configuration
+api_key:
+  description: Airly API key.
+  required: true
+  type: string
+{% endconfiguration %}