Add docker

Dockerfile

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+FROM python:3.7-alpine
+
+COPY requirements.txt /
+
+RUN apk add --update --no-cache --virtual .tmp-build-deps \
+    make libffi-dev musl-dev gcc \
+    && apk add ffmpeg \
+    && pip3 install -r /requirements.txt
+
+COPY audio /moai
+COPY settings.json /moai
+COPY main.py /moai
+
+WORKDIR /moai
+
+USER 1337
+
+CMD ["python3", "main.py"]