message: put a link to pcm-sensor-server docker hub container instructions
diff: @@ -6,6 +6,7 @@ Installation on target system to be analyzed:
  1. Build: `make pcm-sensor-server.x`
  2. As root start pcm-sensor-server.x: `sudo ./pcm-sensor-server.x`
  +Alternatively one can start [pcm-sensor-server as a container from docker hub](https://github.com/opcm/pcm/blob/master/DOCKER_README.md).
  Installation of the grafana front-end (can be on any *host* system with connectivity to the target system):
  1. Make sure curl and docker are installed on the *host*
  