Add history and contributors to readme

README.md

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 # activity-for-brokers
-Active object photometric models, tools, and test cases for LSST Data Brokers
+Active object photometric models, tools, and test cases for LSST Data Brokers.
 
 ## /data
 
@@ -8,3 +8,10 @@ Test cases to be used to validate activity models.  Example comet light curves,
 ## /models
 
 Photometric models designed for active object analysis, especially useful for simple, possibly interactive, tools.
+
+## History
+
+This repository was created as part of a project at the 2024 LSST Solar System Science Collaboration Readiness Sprint.
+
+## Contributors
+- Mike Kelley