Add an example of a systemd.service unit file

Author: mback2k

README.md

@@ -4,3 +4,25 @@ This Go program is a compatibility shim to allow the easy control of docker
 containers via systemd service units.
 
 [![Build Status](https://travis-ci.org/mback2k/docker-systemd-shim.svg?branch=master)](https://travis-ci.org/mback2k/docker-systemd-shim)
+
+Usage
+-----
+The following is an example of a systemd.service unit file which uses this shim to control a container:
+
+```
+[Unit]
+Description=Docker container: your-container-name
+Wants=network.target
+After=docker.service
+Requires=docker.service
+
+[Service]
+Type=notify
+ExecStart=/usr/local/sbin/docker-systemd-shim --container=your-container-name
+Environment=DOCKER_API_VERSION=1.38
+
+[Install]
+WantedBy=docker.service
+```
+
+Replace `your-container-name` with the name of the container you want to control with this unit file.