Add publication on parallel RNTuple writing

Author: hahnjo

_publications/2024-08-29-EuroPar-RNTuple.md

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+---
+layout: default
+title: Parallel Writing of Nested Data in Columnar Formats
+authors: Jonas Hahnfeld, Jakob Blomer, Thorsten Kollegger
+conference: 30th European Conference on Parallel and Distributed Processing (Euro-Par 2024)
+type: IO
+doi: 10.1007/978-3-031-69766-1_2
+www: https://cds.cern.ch/record/2919226/
+---