Add the snoo integration (#36607)

source/_integrations/snoo.markdown

@@ -0,0 +1,44 @@
+---
+title: Snoo
+description: Instructions on how to integrate Snoo into Home Assistant
+ha_category:
+  - Sensor
+ha_iot_class: Cloud Push
+ha_release: 2025.3
+ha_config_flow: true
+ha_codeowners:
+  - '@Lash-L'
+ha_domain: snoo
+ha_platforms:
+  - sensor
+ha_integration_type: integration
+---
+
+The [Snoo](https://www.happiestbaby.com/products/snoo-smart-bassinet) is a smart bassinet made by [Happiest Baby](https://www.happiestbaby.com/) that helps get your baby to sleep and helps keep them asleep.
+
+
+## Installing the integration
+This integration follows standard integration installation. No extra steps are required.
+
+{% include integrations/config_flow.md %}
+
+## Sensors
+
+### State
+
+The Snoo can have one of 8 states
+1. Baseline - This is the basic state the snoo starts with. It has not detected the need to do any further soothing.
+2. Level 1 - This is the lowest level of soothing
+3. Level 2
+4. Level 3
+5. Level 4
+6. Stop - The snoo is no longer running
+7. Pre-timeout - the snoo is preparing to go back to stop rotating
+8. Timeout - the snoo is stopping rotating.
+
+## Time left
+This describes how long until the Snoo will change levels or it is Unknown if it is not currently planning to change levels.
+
+## Removing the integration
+
+{% include integrations/remove_device_service.md %}