Add dataset card

README.md

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+---
+license: cc-by-4.0
+---
+# CREST forcing (parquet)
+EF5/CREST hourly forcing for CONUS, 2016-present, packed as **one tar per variable/year**.
+
+| dir | variable | source | cadence |
+|-----|----------|--------|---------|
+| `mrms/` | precipitation | MRMS QPE (corrected) | hourly |
+| `temp/` | 2 m temperature | NLDAS-2 FORA | hourly |
+| `pet/`  | potential ET | FEWS NET daily PET | daily |
+
+Each `*.tar` expands to individual `.pqf` (Apache Arrow parquet) grids readable by the
+EF5 v4.5 native parquet reader. Used by the Space `vincewin/CREST_AI`.
+
+Download + extract one year, e.g.:
+```python
+from huggingface_hub import hf_hub_download
+import tarfile
+p = hf_hub_download("vincewin/CREST_data", "mrms/mrms_2023.tar", repo_type="dataset")
+tarfile.open(p).extractall("forcing/mrms")
+```