Minio official Docker volume plugin (MinFS)

[denji]

• https://github.com/minio/minfs – A network filesystem client to connect to Minio and Amazon S3 compatible cloud storage servers
  • https://hub.docker.com/r/minio/minfs/
  • Docker volume plugin for MinFS – https://github.com/minio/minfs-docker-plugin

[PI-Victor]

@denji thanks! i see they beat me to it. I will still finish this, since it was part of a coding challenge, and i think it's a good reference to people that want to get started writing a docker plugin with the new system. Will try to improve docs and testing, though :)