Add docker specific files

Dockerfile

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+FROM python:3.7-buster
+
+RUN mkdir /app
+WORKDIR /app
+
+# Use a seperate layer for the project requirements
+COPY ./requirements /app/requirements
+RUN pip install -r requirements/dev.txt
+
+COPY . /app/
+
+# Set the default shell & add a home dir
+RUN useradd -ms /bin/bash newsreader
+USER newsreader