add Dockerfile

.dockerignore

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+.git/
+Dockerfile

Dockerfile

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+FROM ubuntu:latest
+
+RUN apt-get update
+RUN apt-get upgrade -y
+RUN apt-get install python2.7 -y
+RUN apt-get install python-pip -y
+RUN apt-get install python3 -y
+RUN apt-get install python3-pip -y
+
+# run two quick checks
+RUN python2
+RUN python3
+
+WORKDIR /calculator
+COPY * ./
+RUN pip install .
+# doesn't work
+# RUN pip3 install .
+
+ENTRYPOINT [ "python", "my_first_calculator.py" ]