Initial commit: Set up Zephyr MQTT project

Kconfig

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+menu "Home Assistant MQTT Options"
+config HA_MQTT_BROKER_HOSTNAME
+    string "MQTT broker hostname"
+    default "homeassistant.local"
+    help
+      Hostname or IP address of the MQTT broker.
+
+config HA_MQTT_BROKER_PORT
+    int "MQTT broker port"
+    default 1883
+    help
+      Port of the MQTT broker.
+
+config HA_MQTT_USERNAME
+    string "MQTT username"
+    default "test"
+    help
+      Username for MQTT authentication.
+
+config HA_MQTT_PASSWORD
+    string "MQTT password"
+    default "pytest"
+    help
+      Password for MQTT authentication.
+
+config HA_MQTT_NAME
+    string "Device name for Home Assistant device info (name)"
+    default "Irrigation System Modbus MQTT Gateway"
+    help
+      Sets the product name string in the Home Assistant discovery message.
+
+config HA_MQTT_MANUFACTURER
+    string "Manufacturer for Home Assistant device info (mf)"
+    default "Iten Engineering"
+    help
+      Sets the manufacturer string in the Home Assistant discovery message.
+
+config HA_MQTT_MODEL
+    string "Product name for Home Assistant device info (model)"
+    default "Modbus MQTT Gateway"
+    help
+      Sets the product name string in the Home Assistant discovery message.
+
+endmenu
+
+source "Kconfig.zephyr"