docs: add mqtt documentation

documentation/builders/components/mqtt/mqtt-integration.md

@@ -0,0 +1,35 @@
+# MQTT Integration
+
+The MQTT integration allows you to control your Phoniebox via the MQTT protocol. This feature enables not only MQTT 
+control but also integration with home automation systems like Home Assistant.
+
+## Configuration
+
+Set the corresponding setting in `shared\settings\jukebox.yaml` to activate this feature.
+
+``` yaml
+modules:
+    named:
+        ...
+        mqtt: mqtt
+...
+mqtt:
+    enable: true
+    # The client id used in communication with the MQTT broker and identification of the phoniebox
+    client_id: phoniebox_dev
+    # The username to authenticate against the broker
+    username: phoniebox-dev
+    # The password to authenticate against the broker
+    password: phoniebox-dev
+    # The host name or IP address of your mqtt broker
+    host: 127.0.0.1
+    # The port number of the mqtt broker. The default is 1883
+    port: 1883
+```
+
+## Usage in Home Assistant
+
+Home Assistant does not have a native MQTT Media Player integration. To integrate Phoniebox into Home Assistant, you 
+can use the Universal Media Player configuration in combination with the Home Assistant MQTT service.
+
+There is also an HACS addon adding Phoniebox as Media Player https://github.com/c0un7-z3r0/hass-phoniebox