Update README.md (#314)

* Update README.md Adds a citations badge pointing to our DOI. * Committing clang-format changes --------- Co-authored-by: Clang Robot <[email protected]>
NWChemEx · Dec 29, 2023 · 1fe0b1f · 1fe0b1f
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@@ -18,9 +18,9 @@
 
 [![Actions](https://github.com/NWChemEx/PluginPlay/workflows/C_C++_CI/badge.svg)](https://github.com/NWChemEx/PluginPlay)
 
-[Documentation](https://nwchemex.github.io/PluginPlay/)
+[![Citation Badge](https://api.juleskreuer.eu/citation-badge.php?doi=https://doi.org/10.1063/5.0147903)](https://juleskreuer.eu/projekte/citation-badge/)
 
-TODO: add badge when article has DOI.
+[Documentation](https://nwchemex.github.io/PluginPlay/)
 
 PluginPlay is an inversion-of-control (IoC) framework to facilitate wrtiting
 high-performance modular scientific software. More specifically, using