Add LICENSE

LICENSE

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+CellImageNet — License and Attribution
+========================================
+
+CellImageNet is a derivative dataset built from publicly available 10x Genomics
+Xenium datasets. The DAPI image crops in this dataset are transformations
+(cropping / re-framing) of imaging data published by 10x Genomics, Inc.
+
+Source data license
+--------------------
+The underlying 10x Genomics Xenium datasets are distributed by 10x Genomics
+under the Creative Commons Attribution 4.0 International license (CC BY 4.0):
+
+    https://creativecommons.org/licenses/by/4.0/
+
+Because CellImageNet is a derivative work of CC BY 4.0 material, the image crops
+are likewise made available under CC BY 4.0. The cell-type annotations, derived
+metadata, and dataset packaging contributed by the CellImageNet / MorphPT
+authors are also released under CC BY 4.0.
+
+You are free to share and adapt this material for any purpose, including
+commercially, provided that you:
+
+  1. give appropriate credit to 10x Genomics (the source of the imaging data)
+     and to the CellImageNet authors,
+  2. provide a link to the CC BY 4.0 license, and
+  3. indicate that changes were made (the images were cropped / re-framed and
+     re-annotated; they are not the original 10x Genomics files).
+
+Required attribution
+---------------------
+- Imaging data: 10x Genomics, Inc. — Xenium In Situ datasets,
+  https://www.10xgenomics.com/datasets  (each source sample is listed, with its
+  individual dataset page and license, in the dataset card / attribution table).
+- Dataset: CellImageNet — Cao et al., "A visual foundation model for cell
+  classification" (2026).
+
+The per-sample list of source 10x Genomics datasets and their individual
+license confirmations is provided in the dataset card (README.md) under
+"Attribution & source datasets".
+
+No warranty
+-----------
+This dataset is provided "as is", without warranty of any kind. It is intended
+for research use only and is not a medical device.