Update README.md

Author: portableant

README.md

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 ![A social card for this repository](https://repository-images.githubusercontent.com/511317066/1123904f-cfce-40b2-a3f4-775186e178b3)
 
-[![ORCiD](https://img.shields.io/badge/ORCiD-0000--0002--0246--2335-green.svg)](http://orcid.org/0000-0002-0246-2335)
+[![ORCiD](https://img.shields.io/badge/ORCiD-0000--0002--0246--2335-green.svg)](http://orcid.org/0000-0002-0246-2335)   [![DOI](https://zenodo.org/badge/511317066.svg)](https://zenodo.org/badge/latestdoi/511317066)
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 This repository holds raw data mined from the Museum's collections information systems. These data have been released under CC0 license since around 2010.