added build instructions for Docker image

Dockerfile

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+FROM python:3.7
+COPY requirements.txt /
+RUN pip install -r /requirements.txt
+COPY conductor/ /app/conductor
+COPY pyexecplugins/ /app/pyexecplugins 
+COPY pyrest.py /app
+COPY pyexec.py /app
+COPY config.cfg /app
+COPY setup.py /app
+COPY entrypoint.sh /app
+RUN chmod 755 /app/entrypoint.sh
+WORKDIR /app
+ENTRYPOINT ["./entrypoint.sh"]

entrypoint.sh

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+#!/bin/sh
+
+python3 pyrest.py &
+python3 pyexec.py 

requirements.txt

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+requests >= 2.19.1
+