Draft: Add Dockerfile

this Dockerfile will be used by deployment scripts to run multiple containers (one per instrument) on a single host.

docker build . -t pvsimulator

[milosznowak@ymir-pvsimulator pv-simulator]$ docker run pvsimulator -h
usage: main.py [-h] -j JSON -t TARGET_PATH [-c CONFIG]
               [-l {DEBUG,INFO,WARNING,ERROR,CRITICAL}]

Fill this out later.

options:
  -h, --help            show this help message and exit
  -j JSON, --json JSON  The path to the json file.
  -t TARGET_PATH, --target-path TARGET_PATH
                        The path to the target json file.
  -c CONFIG, --config CONFIG
                        The path to the config file.
  -l {DEBUG,INFO,WARNING,ERROR,CRITICAL}, --log_level {DEBUG,INFO,WARNING,ERROR,CRITICAL}
                        Set the logging level.