Update README.md

Author: glyg

README.md

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 # tyssue : An epithelium simulation library
 
+See [This mastodon thread for future work and migration details](https://biologists.social/@glyg/115128613157899428) 
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+## [ANN] Migration to  codeberg
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+Dear tyssue users and contributors,  I am looking for one or several (one can hope) maintainers for this library, for which I unfortunately cannot find any time.
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+I think the mesh creation tool and the APIs could be salvaged, at the coat of the integration 
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+
 
 ## [ANN] Working on a 1.0 release