Add docker file

Dockerfile

+FROM python:3.8
+
+ENV PIP_NO_CACHE_DIR 1
+ENV PYTHONDONTWRITEBYTECODE 1
+ENV PYTHONUNBUFFERED 1
+
+WORKDIR /app
+
+COPY . .
+RUN pip install -r requirements.txt
+
+CMD mkdir -p /source-data && mkdir -p /json-data && python download.py /source-data && python convert.py /source-data /json-data