Update readme.md

conferences/conference-2025/readme.md

@@ -64,6 +64,7 @@ FHE.org 2025 gratefully acknowledges the financial support of <i>(in alphebatica
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+<span style="padding-right:10px"><a href="https://optalysys.com/"><img src="https://github.com/FHE-org/fhe-org.github.io/assets/37557436/604f8663-a8de-4619-939f-f35d8c166d7f" width="150px"></a></span>
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