Add DOI to README.md and CITATION [ci skip]

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diff --git a/CITATION b/CITATION
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--- a/CITATION
+++ b/CITATION
@@ -2,6 +2,7 @@ To cite PROJ in publications use:
 
   PROJ contributors (2020). PROJ coordinate transformation software
   library. Open Source Geospatial Foundation. URL https://proj.org/.
+  DOI: 10.5281/zenodo.5884394
 
 A BibTeX entry for LaTeX users is
 
diff --git a/README.md b/README.md
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--- a/README.md
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@@ -10,6 +10,8 @@
 
 <!-- [![Cirrus Status](https://img.shields.io/cirrus/github/OSGeo/PROJ)](https://cirrus-ci.com/github/OSGeo/PROJ/master) -->
 
+[![DOI](https://zenodo.org/badge/DOI/10.5281/zenodo.5884394.svg)](https://doi.org/10.5281/zenodo.5884394)
+
 PROJ is a generic coordinate transformation software, that transforms
 coordinates from one coordinate reference system (CRS) to another.
 This includes cartographic projections as well as geodetic transformations.