Refresh the dataset card

README.md

@@ -538,3 +538,14 @@ and this card are ever written or removed by the publishing job.
   -- fetch a single file directly, e.g.
   `https://storage.googleapis.com/idc-index-data-artifacts/current/release_artifacts/idc_index.parquet`
 - [IDC user forum](https://discourse.canceridc.dev/)
+
+# Acknowledgments
+
+The data referenced here is maintained in part by the NCI Imaging Data Commons
+and The Cancer Imaging Archive projects, funded in whole or in part with Federal
+funds from the National Cancer Institute, National Institutes of Health,
+Department of Health and Human Services, under Task Order Nos. HHSN26110071 and
+75N91019F00131, under Contract No. HHSN261201500003I. The content of this
+publication does not necessarily reflect the views or policies of the Department
+of Health and Human Services, nor does mention of trade names, commercial
+products, or organizations imply endorsement by the U.S. Government.