Add nVent RAYCHEM SENZ integration (#22394)

source/_integrations/senz.markdown

@@ -0,0 +1,18 @@
+---
+title: nVent RAYCHEM SENZ
+description: Instructions how to integrate SENZ thermostats into Home Assistant.
+ha_category:
+  - Climate
+ha_iot_class: Cloud Polling
+ha_release: 2022.5
+ha_config_flow: true
+ha_codeowners:
+  - '@milanmeu'
+ha_domain: senz
+ha_platforms:
+  - climate
+---
+
+The SENZ integration allows you to control and monitor your nVent RAYCHEM SENZ-WIFI thermostats.
+
+{% include integrations/config_flow.md %}