chore: Add research notice (OHIF#2458)

README.md

@@ -273,6 +273,17 @@ development of OHIF Viewer:
   Leidos Biomedical Research under Task Order HHSN26100071 from NCI.
   [IDC Viewer](https://learn.canceridc.dev/portal/visualization) is a customized
   version of the OHIF Viewer.
+
+### Research notice
+Please note that this repository is participating in a study into sustainability
+ of open source projects. Data will be gathered about this repository for
+ approximately the next 12 months, starting from June 2021.
+
+Data collected will include number of contributors, number of PRs, time taken to
+ close/merge these PRs, and issues closed.
+
+For more information, please visit
+[our informational page](https://sustainable-open-science-and-software.github.io/) or download our [participant information sheet](https://sustainable-open-science-and-software.github.io/assets/PIS_sustainable_software.pdf).
 
 ## License