Add LeaOne integration (#30975)

source/_integrations/leaone.markdown

@@ -0,0 +1,29 @@
+---
+title: LeaOne
+description: Instructions on how to integrate LeaOne devices into Home Assistant.
+ha_category:
+  - Sensor
+ha_release: 2024.2
+ha_iot_class: Local Push
+ha_codeowners:
+  - '@bdraco'
+ha_domain: leaone
+ha_config_flow: true
+ha_platforms:
+  - sensor
+ha_integration_type: integration
+---
+
+Integrates LeaOne health devices into Home Assistant.
+
+LeoOne produces Bluetooth scales and other health devices under the Xiaogui and BAGAIL brands.
+
+## Supported devices
+
+- Bluetooth scale TZC4 (metric)
+- Bluetooth scale TZC4 (imperial)
+- Bluetooth scale QJ-J (metric)
+
+The LeaOne integration cannot automatically discover devices because the LeaOne Bluetooth design uses non-standard discovery.
+
+{% include integrations/config_flow.md %}