feat: Add nifti and dicom example segmentations

[wayfarer3130]

Adds example segmentations to use for testing OHIF with segmentations - both nifti and dicom

[wayfarer3130]

@sedghi - these are all created segmentations so should be safe to merge. If you want Joe to review instead, he can be added as a writer to this repo - I think I can do that.

[sedghi]

can we add data citation to this repo as well. where is data sourced from. something like this, viewer-testdata is missing it

https://github.com/OHIF/Viewers/blob/master/DATACITATION.md

[wayfarer3130]

can we add data citation to this repo as well. where is data sourced from. something like this, viewer-testdata is missing it

https://github.com/OHIF/Viewers/blob/master/DATACITATION.md

Mostly I don't know where the data is sourced from - I don't mind adding it for data I source myself, but the segmentations are all derived data, so aren't the primary citation. Doesn't feel like it really belongs in this PR. I will start creating a second PR trying to get source citations if I can.

[sedghi]

We shouldn't use data if we don't know its licensing. Some of it might require us to give credit, and certain algorithms can also require citations even if they are free.

[fedorov]

Thank you for documenting the sources of data and including the proper acknowledgments in https://github.com/OHIF/Viewers/blob/master/DATACITATION.md!

One thing missing from that page (and that I would strongly encourage you to add) is the statement about licensing applied to the data. For the studies that come from IDC, I used IDC skill to get the licensing information (given StudyInstanceUIDs listed), and almost all of the studies you included are available under CC-BY. With one exception: I would recommend you exclude NSCLC-Radiomics content from your test data, since it does not allow commercial use (see https://www.cancerimagingarchive.net/collection/nsclc-radiomics/).

[wayfarer3130]

@fedorov - I updated it with the license information. Will merge it if it looks ok to you.