deprecation notice in README.md

README.md

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 <img src="https://github.com/COSIMA/logo/blob/master/png/logo_word.png" width="800"/>
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+# _DEPRECATION NOTICE_
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+_ACCESS-NRI has taken on responsibility for ongoing support of ACCESS-OM2, so this repository is not being updated and will eventually be archived._
+
+_**New ACCESS-OM2 experiments and code development should use the latest code release from [ACCESS-NRI/ACCESS-OM2](https://github.com/ACCESS-NRI/ACCESS-OM2) and configurations from [ACCESS-NRI/access-om2-configs](https://github.com/ACCESS-NRI/access-om2-configs), and all new issues should be posted on one of those repositories.**_
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 # ACCESS-OM2
 
 ACCESS-OM2 is a global coupled ocean - sea ice model being developed by [COSIMA](http://www.cosima.org.au).