Add README with subset configs

README.md

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+---
+configs:
+  - config_name: eukaryote_generator
+    data_files:
+      - split: train
+        path: eukaryote_generator/**/*.parquet
+  - config_name: mrna_evo2
+    data_files:
+      - split: train
+        path: mrna_evo2/*.parquet
+  - config_name: mrna_splice_evo2
+    data_files:
+      - split: train
+        path: mrna_splice_evo2/*.parquet
+  - config_name: prokaryote_evo2
+    data_files:
+      - split: train
+        path: prokaryote_evo2/*.parquet
+---
+
+# Carbon pretraining corpus
+
+Private aggregation of the four sources used for Carbon pure-DNA pretraining,
+all stored as parquet for direct `load_dataset` access.
+
+## Subsets
+
+| Subset | Source | Description |
+|---|---|---|
+| `eukaryote_generator` | [GenerTeam/pretrain_data_eukaryote](https://huggingface.co/datasets/GenerTeam/pretrain_data_eukaryote) | Eukaryote DNA, sharded by species (`fungi/`, `plants/`, `protozoa/`, `vertebrate_mammalian/`, ...) |
+| `mrna_evo2` | [arcinstitute/opengenome2 / mrna](https://huggingface.co/datasets/arcinstitute/opengenome2/tree/main/json/pretraining_or_both_phases/mrna) | mRNA sequences, train chunks only |
+| `mrna_splice_evo2` | [arcinstitute/opengenome2 / mrna_splice_promoter](https://huggingface.co/datasets/arcinstitute/opengenome2/tree/main/json/pretraining_or_both_phases/mrna_splice_promoter) | mRNA + splice + promoter, train chunks only |
+| `prokaryote_evo2` | [arcinstitute/opengenome2 / gtdb_v220_imgpr](https://huggingface.co/datasets/arcinstitute/opengenome2/tree/main/json/pretraining_or_both_phases/gtdb_v220_imgpr) | Prokaryote (GTDB v220 + IMG/PR), train chunks only |
+
+Test splits from opengenome2 are not included (this is a pretraining corpus).
+
+## Usage
+
+```python
+from datasets import load_dataset
+
+# pick any subset
+ds = load_dataset("hf-carbon/carbon-pretraining-corpus", "mrna_evo2", split="train", streaming=True)
+print(next(iter(ds)))
+```
+
+## License
+
+Defer to upstream sources:
+- GenerTeam/pretrain_data_eukaryote — see upstream repo.
+- arcinstitute/opengenome2 — see upstream repo.