Update README.md

Author: GiovanniBordiga

README.md

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 [![Paper](https://img.shields.io/badge/Paper-10.1038/s41563--024--02008--6-blue?logoColor=ecf0f1&labelColor=34495e)](https://doi.org/10.1038/s41563-024-02008-6)
 [![DOI](https://img.shields.io/badge/Data-10.5281/zenodo.12823471-blue?logo=zenodo&logoColor=ecf0f1&labelColor=34495e)](https://doi.org/10.5281/zenodo.12823471)
 [![arXiv](https://img.shields.io/badge/arXiv-2403.08078-b31b1b?logo=arXiv&logoColor=arXiv&labelColor=34495e)](https://arxiv.org/abs/2403.08078)
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+[![Hits](https://hits.seeyoufarm.com/api/count/incr/badge.svg?url=https%3A%2F%2Fgithub.com%2Fbertoldi-collab%2FDifFlexMM&count_bg=%2327AE60&title_bg=%2334495E&icon=github.svg&icon_color=%23E7E7E7&title=Hits&edge_flat=false)](https://hits.seeyoufarm.com)
 
 **Dif**ferentiable **Flex**ible **M**echanical **M**etamaterials