add Dockerfile and README.md

Dockerfile

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+FROM python:3.8.1-buster
+RUN apt update && apt upgrade -y
+RUN pip install pelican==4.2.0
+WORKDIR /site
+RUN mkdir -p /site-generated
+ENTRYPOINT ["pelican", "-Dr", "-o", "/site-generated"]

README.md

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+# Docker image with [Pelican](https://blog.getpelican.com/)
+
+Create a volume for the output files.
+```
+docker volume create pelican_files
+```
+Run the pelican build with your site, replace `<your-site-dir>` with the directory of your Pelican source files. The output will be written into the previously created volume `pelican_files`. Changes are regenerated automatically.
+```
+docker run --detach \
+--name=pelican \
+--volume <your-site-dir>:/site \
+--volume pelican_files:/site-generated \
+boonto/pelican:3.8.1-4.2.0
+```
+May be used in conjunction with the [nginx](https://hub.docker.com/_/nginx) container to serve the output.
+```
+docker run --detach \
+--name=site \
+--volume pelican_files:/usr/share/nginx/html:ro \
+nginx
+```