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Croissant v7: both sha256+md5

Croissant v6: use cr:sha256 direct key

Croissant v5: fix FileObject sha256

Croissant v4: rai: prefix keys, FileObject+containedIn, fix glob

Fix Croissant v3: RAI namespace, glob pattern, folder names

Update README: paper title, FL-TB, standardized naming

Rename folders to match main repo naming

Update README

Fix Croissant: add source to fields, add citeAs (v2)

Add Croissant metadata v1.0 with RAI fields

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initial commit