Add timer to sensibo (#23139)

Co-authored-by: J. Nick Koston <nick@koston.org>

source/_integrations/sensibo.markdown

@@ -8,6 +8,7 @@ ha_category:
   - Number
   - Select
   - Sensor
+  - Switch
   - Updates
 ha_release: 0.44
 ha_iot_class: Cloud Polling
@@ -23,6 +24,7 @@ ha_platforms:
   - number
   - select
   - sensor
+  - switch
   - update
 ha_homekit: true
 ha_dhcp: true
@@ -85,6 +87,12 @@ For Pure devices, these sensors are available:
 - PM2.5
 - Pure Boost Sensitivity
 
+## Switch Entities
+
+For supported devices, this integration provides support to enable/disable a timer to delay a start or stop (depending on the current state) of your device.
+
+The switch uses a timer of 60 minutes delay. You can choose a custom delay using the custom `sensibo.enable_timer` service. See [Timer](#timer).
+
 ## Custom Services
 
 ### Pure Boost
@@ -96,6 +104,10 @@ You can configure your Pure Boost settings by using the services `sensibo.enable
 
 Using Geo integration for Pure Boost is only possible by pre-configuration of Presence within the app.
 
+### Timer
+
+You can enable a timer with a custom delay using the service `sensibo.enable_timer` that is provided.
+
 ## Adding a quick switch example
 
 If you want a "Quick Switch" to turn your AC On / Off, you can do that using the following `Switch Template`: