Update README.md

Author: geopayme

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 # ARGOS Dataset Directory
 
+[![Dataset DOI](https://zenodo.org/badge/DOI/10.5281/zenodo.17645085.svg)](https://doi.org/10.5281/zenodo.17645085)
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 This directory contains all synthetic datasets used for experiments, ablation
 studies, and reproducibility in the **ARGOS (Adaptive Recursive Gradient
 Optimization System)** project.