Describe docker compose example

ReadMe.md

@@ -38,3 +38,22 @@ Set the following parameter:
 
 
  ```docker run -t -i --device=/dev/ttyUSB0 -e SERIAL_DEVICE="/dev/ttyUSB0" -e MQTT_SERVER="192.168.x.y" -e MQTT_TOPIC="testtopic/" sha256:```
+
+#### Execution via Docker Compose
+```
+# template docker-compose.yml
+services:
+    python_app:
+        attach: false
+        build:
+            context: .
+            dockerfile: Dockerfile
+        environment:
+        - SERIAL_DEVICE=/dev/ttyUSB0
+        - MQTT_SERVER=192.168.x.y
+        - MQTT_TOPIC=testtopic/
+        devices:
+        - "/dev/ttyUSB0:/dev/ttyUSB0"
+```
+build image: **docker-compose up --build**
+start with **docker-compose up --detach**