Refresh CIS Barómetros README

spain/barometro_cis/README.md

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+# CIS Barómetros — processed dataset
+
+Tidy, month-indexed Parquet produced by the pipeline at
+<https://github.com/victoriano/social-sciences-microdata>.
+
+## Files
+
+- `processed_barometros.parquet` — one row per respondent, columns in
+  Spanish (variable labels from the CIS SPSS metadata). Includes a
+  monthly `date_of_study` rebuilt via the catalogue index.
+- `barometros_index.csv` — the catalogue entry for every estudio the
+  pipeline considered, including slug and download date.
+
+## Quick start
+
+```python
+from huggingface_hub import hf_hub_download
+import pandas as pd
+
+path = hf_hub_download(
+    repo_id="victoriano/social-sciences-microdata",
+    filename="spain/barometro_cis/processed_barometros.parquet",
+    repo_type="dataset",
+)
+df = pd.read_parquet(path)
+```