Add documentation for Yardian integration (#28391)

Co-authored-by: J. Nick Koston <nick@koston.org>
Co-authored-by: Franck Nijhof <frenck@frenck.nl>

source/_integrations/yardian.markdown

@@ -0,0 +1,28 @@
+---
+title: Yardian
+description: Instructions on how to integrate Yardian device within Home Assistant.
+ha_category:
+  - Irrigation
+  - Switch
+ha_config_flow: true
+ha_release: 2023.9
+ha_iot_class: Local Polling
+ha_codeowners:
+  - '@h3l1o5'
+ha_domain: yardian
+ha_platforms:
+  - switch
+ha_integration_type: integration
+---
+
+The Yardian integration allows you to control your [Yardian Smart Sprinkler Controller](https://yardian.com/products/yardian-pro-smart-sprinkler-controller/).
+
+There is currently support for the following platform within Home Assistant:
+
+- [Switch](#switch) - Allows you to view the status of zones and control them.
+
+{% include integrations/config_flow.md %}
+
+During the configuration, you will have to manually set the **Host** and the **Access Token**. You can find them inside your [Yardian App](https://yardian.com/app/).
+
+![Yardian Host/Token Location](/images/integrations/yardian/yardian_config_flow.jpg)