Added Walter Bender's slides

diff --git a/Walter_Bender/Ingestum A FOSS NLP document ingestion library Martín Abente Lahaye, Juan Pablo Ugarte, Walter Bender LibrePlanet, March 21, 2021.pdf b/Walter_Bender/Ingestum A FOSS NLP document ingestion library Martín Abente Lahaye, Juan Pablo Ugarte, Walter Bender LibrePlanet, March 21, 2021.pdf
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