Add covidaki metadata

covidaki_metadata.json

@@ -0,0 +1,19 @@
+{
+  "dataset_name": "covidaki",
+  "download_urls": {
+    "GSE225349_metadata": "https://ftp.ncbi.nlm.nih.gov/geo/series/GSE225nnn/GSE225349/matrix/GSE225349_series_matrix.txt.gz",
+    "GSE225349_covid_AKI": "https://ftp.ncbi.nlm.nih.gov/geo/series/GSE225nnn/GSE225349/suppl/GSE225349_non-normalized_counts_covid_AKI.txt.gz",
+    "GSE225349_covid_only": "https://ftp.ncbi.nlm.nih.gov/geo/series/GSE225nnn/GSE225349/suppl/GSE225349_non-normalized_counts_covid_only.txt.gz"
+  },
+  "download_timestamp": "2025-07-22 17:21:10.730042",
+  "statistics": {
+    "num_samples": 1135,
+    "num_features": 4702,
+    "target_stats": {
+      "mean": 0.9092511013215859,
+      "std": 0.28725169462871586,
+      "min": 0.0,
+      "max": 1.0
+    }
+  }
+}