Add FiberFox dMRI phantoms for motion correction benchmarking

[yarikoptic]

Spotted on https://github.com/datalad/datalad-usage-dashboard#active

https://osf.io/hae2u/ : FiberFox dMRI phantoms for motion correction benchmarking

[raamana]

Cool! Hi @arokem, do you want to add it to the niQC's website? :)