Added starter code for datasets information.

src/MEDS-DEV/datasets/MIMIC-IV/README.md

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+# MIMIC-IV
+
+TODO: Summarize MIMIC-IV
+
+TODO: Add citations properly somehow.
+
+## URLs
+
+1. https://physionet.org/content/mimiciv/
+2. https://www.nature.com/articles/s41597-022-01899-x

src/MEDS-DEV/datasets/MIMIC-IV/predicates/README.md

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+# Custom MIMIC-IV Predicates
+
+MIMIC-IV uses several coding schemes that are captured in these predicates.
+
+TODO: info

src/MEDS-DEV/datasets/MIMIC-IV/predicates/defaults.yaml

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+hospital_admission:
+  code: { regex: "^HOSPITAL_ADMISSION//.*" }
+hospital_discharge:
+  code: { regex: "^HOSPITAL_DISCHARGE//.*" }
+
+ED_registration:
+  code: { regex: "^ED_REGISTRATION//.*" }
+ED_discharge:
+  code: { regex: "^ED_OUT//.*" }
+
+icu_admission:
+  code: { regex: "^ICU_ADMISSION//.*" }
+icu_discharge:
+  code: { regex: "^ICU_DISCHARGE//.*" }
+
+death:
+  code: MEDS_DEATH

src/MEDS-DEV/datasets/README.md

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+# Datasets
+
+This folder contains details for datasets currently included in the MEDS-DEV effort.
+
+TODO: More details.
+
+## Notes
+
+If you have a version of a task configuration file that is more specialized to a dataset than can be achieved
+with overwriting the predicates alone, then (1) make a GitHub issue explaining why the existing file is not
+used, and (2) add a file here `../tasks/$DATASET_NAME/$TASK_NAME.yaml` with that configuration.