Started fleshing out README

README.md

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-# CoverUp
+# CoverUp: AI-Powered Python Test Coverage Improver
+by [Juan Altmayer Pizzorno](https://jaltmayerpizzorno.github.io) and [Emery Berger](https://emeryberger.com)
+at UMass Amherst's [PLASMA lab](https://plasma-umass.org/).
+
+## About CoverUp
+...
+
+## Using
+...
+
+# Acknowledgements
+
+This material is based upon work supported by the National Science
+Foundation under Grant No. 1955610. Any opinions, findings, and
+conclusions or recommendations expressed in this material are those of
+the author(s) and do not necessarily reflect the views of the National
+Science Foundation.