added documentation for (new) TOLO Sauna (tolo) integration (#19177)

Co-authored-by: Franck Nijhof <git@frenck.dev>

source/_integrations/tolo.markdown

@@ -0,0 +1,25 @@
+---
+title: TOLO Sauna
+description: Control your TOLO Sauna and TOLO Steam Bath with Home Assistant.
+ha_release: "2021.12"
+ha_category:
+  - Climate
+ha_domain: tolo
+ha_config_flow: true
+ha_codeowners:
+  - '@MatthiasLohr'
+ha_iot_class: "Local Polling"
+ha_platforms:
+  - climate
+ha_dhcp: true
+---
+
+The TOLO Sauna integration allows you to control your [TOLO Sauna and TOLO Steam Bath](https://www.tolosauna.com/) with Home Assistant.
+
+The integration allows for:
+
+- Turning the sauna on and off
+- Setting the target temperature and target humidity
+- Controlling the fan (used for drying and cooling down the sauna)
+
+{% include integrations/config_flow.md %}