First rough draft

This is a first rough draft that is in no way intended for production use.

Build the docker container by running docker build -t mpm in the directory.
The password manager can then be run using docker run --rm -d --name mpm -p 80:80 mpm.
The password manager is then available on http://localhost.
Attention: The password manager only works on localhost or an connection that is secured using https. Otherwise the WebCrypto API is not available in browsers and encryption can't work.

When the container is stopped, all data is lost.