Add Docker image and compose with documentation

Dockerfile

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+FROM python:3.6-alpine AS build
+RUN apk add build-base python3-dev linux-headers pcre-dev jpeg-dev zlib-dev
+RUN pip install --upgrade pip
+RUN pip install yt-dlp pillow uwsgi
+
+FROM python:3.6-alpine AS deps
+WORKDIR /twitfix
+COPY requirements.txt requirements.txt
+COPY --from=build /usr/local/lib/python3.6/site-packages /usr/local/lib/python3.6/site-packages
+RUN pip install -r requirements.txt
+
+FROM python:3.6-alpine AS runner
+EXPOSE 9000
+RUN apk add pcre-dev jpeg-dev zlib-dev
+WORKDIR /twitfix
+CMD ["uwsgi", "twitfix.ini"]
+COPY --from=build /usr/local/bin/uwsgi /usr/local/bin/uwsgi
+COPY --from=deps /usr/local/lib/python3.6/site-packages /usr/local/lib/python3.6/site-packages
+COPY . .