Add documentation for OSO Energy integration (#22456)

Co-authored-by: Marian Graurov <marian.graurov@icbdigital.no>
Co-authored-by: Franck Nijhof <frenck@frenck.nl>

CODEOWNERS

@@ -537,6 +537,7 @@ source/_integrations/opower.markdown @tronikos
 source/_integrations/oralb.markdown @bdraco @Lash-L
 source/_integrations/oru.markdown @bvlaicu
 source/_integrations/oru_opower.markdown @tronikos
+source/_integrations/osoenergy @osohotwateriot
 source/_integrations/otbr.markdown @home-assistant/core
 source/_integrations/ourgroceries.markdown @OnFreund
 source/_integrations/overkiz.markdown @imicknl @vlebourl @tetienne @nyroDev

source/_integrations/osoenergy.markdown

@@ -0,0 +1,32 @@
+---
+title: OSO Energy
+description: Instructions on how to integrate OSO Energy devices with Home Assistant.
+ha_release: "2024.1"
+ha_category:
+  - Sensor
+  - Water Heater
+ha_iot_class: Cloud Polling
+ha_codeowners:
+  - '@osohotwateriot'
+ha_domain: osoenergy
+ha_platforms:
+  - water_heater
+ha_config_flow: true
+ha_integration_type: integration
+---
+
+The OSO Energy integration for Home Assistant allows you to interact with supported devices and services offered by [OSO Energy](https://www.osoenergy.no)
+
+This OSO Energy integration uses a subscription key, which a user can create for his account on the [OSO Energy website](https://portal.osoenergy.no/), to configure it within Home Assistant. Once configured Home Assistant will detect and add all OSO Energy devices.
+
+{% include integrations/config_flow.md %}
+
+## Platforms
+
+### Water Heater
+
+The OSO Energy water heater platform integrates your OSO Energy devices into Home Assistant.
+
+The platform supports the following OSO Energy devices:
+
+- Water Heaters