Create README.md

Author: maelle

README.md

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+# rdefra
+
+[![Project Status: Unsupported](https://www.repostatus.org/badges/latest/unsupported.svg)](https://www.repostatus.org/#unsupported)
+[![Peer-review badge](https://badges.ropensci.org/68_status.svg)](https://github.com/ropensci/software-review/issues/68)
+
+This package has been archived. The former README is now in [README-old](README-not.md).