Provide .wci.yml file for https://workflows.community initiative

[yarikoptic]

See https://workflows.community/systems/contribute for more info, an example on https://github.com/frobnitzem/mpi_list/blob/master/docs/.wci.yml and here is a PR to adjust or to chase with another one to add pointer to such a file: workflowscommunity/workflowscommunity.github.io#74