Add Open-Meteo integration (#20478)

source/_integrations/open_meteo.markdown

@@ -0,0 +1,26 @@
+---
+title: Open-Meteo
+description: Instructions on how to integrate Open-Meteo within Home Assistant.
+ha_category:
+  - Weather
+ha_release: 2022.2
+ha_iot_class: Cloud Polling
+ha_config_flow: true
+ha_codeowners:
+  - '@frenck'
+ha_domain: open_meteo
+ha_platforms:
+  - weather
+---
+
+The Open-Meteo integration integrates the free weather forecast from
+[Open-Meteo](https://open-meteo.com) with Home Assistant.
+
+Open-Meteo offers free weather forecast APIs for open-source developers and
+non-commercial use. No account or API key is required to use this service.
+
+Open-Meteo collaborates with National Weather Services providing Open Data
+with 11 to 2 km resolution. Their high-performance APIs select the best
+weather model for your location.
+
+{% include integrations/config_flow.md %}