add 2025 poster documentation (#153)

Author: d33bs

docs/src/media/cytodataframe-2025-poster.pdf

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+# SBI2 Annual Confrerence 2025 Poster
+
+We presented `CytoDataFrame` during the [SBI2 annual conference (2025)](https://sbi2.org/conference/) poster sessions.
+
+See below for the [poster](https://cytomining.github.io/cytodataframe/media/cytodataframe-2025-poster.pdf) or reference our Zenodo record here: [https://doi.org/10.5281/zenodo.17524610](https://doi.org/10.5281/zenodo.17524610)
+
+<iframe src="https://cytomining.github.io/cytodataframe/media/cytodataframe-2025-poster.pdf" width="100%" height="600px"></iframe>