Add workshop announcement to index.md

Added announcement for the 3rd Accelerator Middle Layer Workshop.

Author: gubaidulinvadim

index.md

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+Join us for [the 3rd Accelerator Middle Layer Workshop](https://indico.synchrotron-soleil.fr/event/125/) hosted at Synchrotron SOLEIL in France on February 2-4 2026!
+
 Python Accelerator Middle Layer (pyAML) is a joint technology platform for **design**, **commissioning** and **operation** of particle accelerators.
 
 It is developed, benchmarked and maintained collaboratively by an open-source community driven by accelerator facilities around the world.