Update README.md

README.md

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----
-license: other
-license_name: penn-license
-license_link: LICENSE
----
+---
+license: other
+license_name: penn-license
+license_link: LICENSE
+tags:
+- SpatialTranscriptomics
+- VirtualPrediction
+---
+Virtual spatial transcriptomics by AURORA of TCGA-LUAD, TCGA-KIRC, TCGA-BRCA and BRCA pre-chemotherapy (https://doi.org/10.1038/s41586-021-04278-5) samples. Virtual spatial transcriptomics are stored in *.h5* format:
+
+  - `pos`: spatial coordinates of patches (224 pixels * 224 pixels). This is the coordinates of the upper left corner of each patch.
+  - `gene_exp`: gene expressions. The names of the genes are stored in `genes.csv`.
+  - `celltype_prop`: cell type proportions in log scales. The name of the cell types are stored in `celltypes.csv`.