Add citation to readme

Adding zenodo link and citation

README.md

@@ -1,5 +1,7 @@
 # Library Carpentry: Python Intro for Libraries
 
+[![DOI](https://zenodo.org/badge/DOI/10.5281/zenodo.12582386.svg)](https://doi.org/10.5281/zenodo.12582386)
+
 ## Maintainers for Library Carpentry: Python Intro for Libraries
 - [Cody Hennesy](https://github.com/chennesy) (lead)
 - [Tim Dennis](https://github.com/jt14den)
@@ -39,6 +41,6 @@ Library Carpentry is authored and maintained through issues, commits, and pull r
 
 ## Citation
 
-(Add citation once Zenodo is updated)
+James Allen, Markus J. Ankenbrand, James Baker, Sean Barberie, Christian Calogero Barra, Trevor Bekolay, John Blischak, K. Azalee Bostroem, Andrew P Boughton, Geoffrey Boushey, Hugo Bowne-Anderson, Petrina Collingwood, Logan Cox, Matt Critchlow, Tim Dennis, Jonah Duckles, Shyam Dwaraknath, Jason Ellis, Rémi Emonet, … yremmits. (2024). LibraryCarpentry/lc-python-intro: Python Intro for Libraries 2024-06 Update (2024.06). Zenodo. https://doi.org/10.5281/zenodo.12582386