Create README.md

README.md

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+---
+license: cc-by-4.0
+tags:
+  - single-cell
+  - scRNA-seq
+  - genomics
+---
+
+# CellxGene 45M Collection
+
+A curated subset of [CellxGene](https://cellxgene.cziscience.com/) (~30M cells) used to align the **Stack model** after pretraining on full human scBaseCount.
+
+## Selection Criteria
+
+- ≥ 50,000 cells per dataset
+- ≥ 5 donors per dataset
+
+## Cell Type Annotations
+
+Author-annotated coarse-grained cell type labels were heuristically identified and transferred to adata.obs["author_cell_type"].