Add initial documentation for new SMLIGHT SLZB integration (#33053)

* Initial documentation for SMLIGHT SLZB Zigbee adapter integration

* Apply suggestions from code review

Co-authored-by: c0ffeeca7 <38767475+c0ffeeca7@users.noreply.github.com>

* Tweaks

* Update source/_integrations/smlight.markdown

* Update source/_integrations/smlight.markdown

---------

Co-authored-by: c0ffeeca7 <38767475+c0ffeeca7@users.noreply.github.com>

source/_integrations/smlight.markdown

@@ -0,0 +1,47 @@
+---
+title: SMLIGHT SLZB
+description: The SMLIGHT SLZB integration allows users to monitor and manage their SMLIGHT SLZB-06x devices from directly within Home Assistant.
+ha_category:
+  - Sensor
+ha_release: 2024.9
+ha_iot_class: Local Polling
+ha_config_flow: true
+ha_domain: smlight
+ha_zeroconf: true
+ha_platforms:
+  - sensor
+ha_codeowners:
+  - '@tl-sl'
+ha_integration_type: device
+---
+
+The [SMLIGHT](https://smlight.tech) SLZB-06x Ethernet Zigbee coordinators
+provide a convenient way to add Zigbee to your smart home setup.
+
+The **SMLIGHT SLZB** {% term integration %} allows users to monitor and manage their SLZB-06x devices
+directly from within Home Assistant and to directly access many of the
+features found in the SMLIGHT web UI. You can also use these in your automations.
+
+## Prerequisites
+
+You need a supported SLZB-06 adapter.
+
+ This integration has been tested with the following devices:
+
+- [SLZB-06](https://smlight.tech/product/slzb-06)
+- [SLZB-06M](https://smlight.tech/product/slzb-06m)
+- [SLZB-06p7](https://smlight.tech/product/slzb-06p7)
+- [SLZB-06p10](https://smlight.tech/product/slzb-06p10/)
+  
+{% include integrations/config_flow.md %}
+
+## Integration entities
+
+The following sensors will be created:
+
+- **Core Temperature** - Temperature of core ESP32
+- **Zigbee Temperature** - Temperature of Zigbee CC2652 or EFR32 chip
+- **Core Uptime** - Uptime of Core device
+- **Zigbee Uptime** - Uptime of Zigbee connection to ZHA/Z2M
+- **RAM Usage** - Monitor RAM Usage
+- **FS Usage** - Monitor filesystem usage