Modern forms sensor platform (#18333)

* Add Modern Forms sensor platform

* Tweak

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

source/_integrations/modern_forms.markdown

@@ -4,6 +4,7 @@ description: Instructions on how to integrate a Modern Forms Smart Fan with Home
 ha_category:
   - Fan
   - Light
+  - Sensor
   - Switch
 ha_release:  2021.7
 ha_iot_class: Local Polling
@@ -16,6 +17,7 @@ ha_zeroconf: true
 ha_platforms:
   - fan
   - light
+  - sensor
   - switch
 ---
 
@@ -23,6 +25,12 @@ ha_platforms:
 
 {% include integrations/config_flow.md %}
 
+<div class='note'>
+
+If the Modern Forms fan does not have a light unit installed, then the Light entities and services will not show up.
+
+</div>
+
 ## Fans
 
 The Modern Forms integration has support for the Modern Forms fans. This includes directional support, and sleep timer services for the fan.
@@ -31,6 +39,13 @@ The Modern Forms integration has support for the Modern Forms fans. This include
 
 The Modern Forms integration has support for the Modern Forms fans light. This includes brightness, and sleep timer services for the light.
 
+## Sensors
+
+The Modern Forms integration provides sensors for the following information:
+
+- Fan sleep timer time expiring
+- Light sleep timer time expiring
+  
 ## Switches
 
 The Modern Forms integration provides support for the following toggleable attributes of a fan: