Document salt device_tracker platform (#11811)

* Document salt device_tracker platform

* ✏️ Tweaks

* Update salt.markdown

* Indicate all fields required

* Bump ha_release

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

source/_integrations/salt.markdown

@@ -0,0 +1,47 @@
+---
+title: Salt Fiber Box
+description: Instructions on how to integrate Salt Fiber Box router into Home Assistant.
+logo: salt.png
+ha_category:
+  - Presence Detection
+ha_iot_class: Local Polling
+ha_codeowners:
+  - '@bjornorri'
+ha_release: '0.106.0'
+---
+
+The `salt` platform offers presence detection by looking at connected devices to a [Salt Fiber Box](https://fiber.salt.ch/en/fiber/equipment/fiber-box) router from [Salt](https://www.salt.ch), which is an internet provider in Switzerland.
+
+<div class='note'>
+The router only allows one user session at a time. If you log into the router's web interface, the platform will stop updating until you log out.
+</div>
+
+## Configuration
+
+To use a Salt Fiber Box router in your installation, add the following to your `configuration.yaml` file:
+
+```yaml
+# Example configuration.yaml entry
+device_tracker:
+  - platform: salt
+    host: 192.168.1.1
+    username: admin
+    password: YOUR_PASSWORD
+```
+
+{% configuration %}
+host:
+  description: The IP address of your router, e.g. `192.168.1.1`.
+  required: true
+  type: string
+username:
+  description: The username used to log into the router's web interface, e.g. `admin`.
+  required: true
+  type: string
+password:
+  description: The password used to log into the router's web interface.
+  required: true
+  type: string
+{% endconfiguration %}
+
+See the [device tracker integration page](/integrations/device_tracker/) for instructions how to configure the people to be tracked.