Add CryoAtlas v1.0 test set: README.txt

test/README.txt

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+CryoAtlas v1.0 — Test Set
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+The complete CryoAtlas test set contains 1,152 EMD entries. Each entry includes an experimental cryo-EM density map, corresponding atomic structure file(s), and protein sequences.
+
+The data are provided in two archives:
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+- CryoAtlas_v1.0_test_benchmark_618.tar.gz
+  Contains the 618-target common benchmark used for cross-method comparison in the paper. This subset was obtained after training-overlap filtering and selecting targets with valid outputs from all evaluated learning-based methods.
+
+- CryoAtlas_v1.0_test_remaining_534.tar.gz
+  Contains the other 534 entries from the complete test split. These entries remain available for broader evaluation and future method development.
+
+The 618 targets are included within the 1,152-entry test set. The two archives contain no overlapping EMD entries; together, they reconstruct the complete test set. The remaining 534 entries should not be interpreted as a collection of failed predictions, because benchmark membership also depends on eligibility filtering.
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+Each archive can be extracted independently. Extract both into the same directory to obtain all 1,152 entries under CryoAtlas_v1.0/test/.
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+The metadata directory provides subset-specific EMD lists, file inventories, and SHA256 checksums. Original map, CIF, and FASTA contents are preserved.