Metaphlan 4.0.3 databases resources

This external resource is proposed to help usage of Metaphlan 4 (https://github.com/biobakery/metaphlan) in docker context for usage in workflows such as Nextflow or Scitq.

It is meant to be used with this docker: https://hub.docker.com/r/gmtscience/metaphlan4

(which source is here: https://github.com/gmtsciencedev/bioit-dockers)