Update 2023.md

Author: stevenah

_editions/2023.md

@@ -17,6 +17,9 @@ The MediaEval 2023 Workshop will be held 1-2 February, collocated with [MMM 2024
 * Workshop schedule is here: [MediaEval 2023 Workshop Program](https://multimediaeval.github.io/editions/2023/docs/MultimediaEval_2023_Detailed_Program.pdf)
 * Proceedings: [MediaEval 2023 Working Notes Proceedings](https://ceur-ws.org/Vol-3658/)
 
+Workshop group photo:
+
+<img src="https://multimediaeval.github.io/editions/2023/docs/mediaeval2023GroupPhoto.jpg" width=300/>
 
 ### Task schedule 
 * July-September 2023: Validation data release