Add Nettigo Air Monitor integration documentation (#17419)

source/_integrations/nam.markdown

@@ -0,0 +1,30 @@
+---
+title: Nettigo Air Monitor
+description: Instructions on how to integrate Nettigo Air Monitor within Home Assistant.
+ha_category:
+  - DIY
+ha_release: 2021.6
+ha_iot_class: Local Polling
+ha_config_flow: true
+ha_codeowners:
+  - '@bieniu'
+ha_domain: nam
+ha_platforms:
+  - air_quality
+  - sensor
+ha_quality_scale: platinum
+---
+
+The Nettigo Air Monitor integration allows you to read temperature, humidity, pressure and air quality data from Nettigo Air Monitor devices. [Nettigo Air Monitor](https://air.nettigo.pl/?setlang=en) is a DIY air quality monitoring system with open source firmware, based on an open hardware project.
+
+The integration currently has support for the following sensors:
+
+- BME280
+- BMP280
+- DHT22
+- HECA
+- SDS011
+- SHT3X
+- SPS30
+
+{% include integrations/config_flow.md %}