Add arXiv + DOI badges to the model card

README.md

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 # GB-LSR: Global-Bandwidth Local Spectral Representation
 
+[![arXiv](https://img.shields.io/badge/arXiv-2606.19617-b31b1b.svg)](https://arxiv.org/abs/2606.19617) [![DOI](https://img.shields.io/badge/DOI-10.48550%2FarXiv.2606.19617-blue.svg)](https://doi.org/10.48550/arXiv.2606.19617)
+
 Trained weights for **GB-LSR**, a fixed-grid local spectral image
 representation: the image is partitioned into non-overlapping patches, each
 carrying a small block of truncated-Fourier coefficients predicted from a