Adding README amd docker info

backend/production-docker/Dockerfile

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+FROM python:3.8-buster
+COPY requirements.txt /tmp/requirements.txt
+RUN pip3 install -r /tmp/requirements.txt
+
+# So that it can find the certs
+WORKDIR /app
+
+CMD [ "python", "/app/backend.py" ]
+

backend/production-docker/requirements.txt

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+aiohttp
+async-timeout
+chardet==2.3.0
+multidict
+python-engineio
+six==1.10.0
+yarl
+flask
+
+eventlet
+requests
+validators
+
+bleach==3.2.1
+html5lib==0.9999999       # via bleach
+timeago
+html2text
+
+# @notes
+# - Dont install socketio, it interferes with flask_socketio