Update README.md

added text distingusihing between operational and research rounds.

README.md

@@ -7,6 +7,15 @@ which provides a set of data formats and open source tools for modeling hubs.
 The Consortium of Infectious Disease Modeling Hubs. The hubverse: open tools for 
 collaborative modeling. GitHub release v2.0.0, 14 Jul 2023. URL: https://github.com/Infectious-Disease-Modeling-Hubs
 
+## Research vs. Operational Rounds
+
+This reposistory is intended for the Scenario Modeling Hub's _research_ rounds, which are intended to encourage modeling 
+to address specific research questions. Possibilities that have been discussed include the impact of disparities (desscribed below) 
+revisiting early stages of a pandemic. Additional research rounds may follow. 
+
+The research rounds are distinct from the _operational_ rounds were the sole focus of the Scenario Modeling Hub from 
+late 2020-April 2024. For information on those efforts, see the [operational round GitHub site](https://github.com/midas-network/covid19-scenario-modeling-hub).
+
 ## How to participate    
 
 The Scenario Modeling Hub is open to any team willing to provide projections