Add Zenodo DOI badge to README

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: mvdoc

README.md

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 # Hyperface fMRI Dataset
 
+[![DOI](https://zenodo.org/badge/1047675518.svg)](https://doi.org/10.5281/zenodo.19038401)
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 This repository contains analysis code and quality assurance tools for the Hyperface fMRI dataset. The dataset consists of fMRI data collected while participants viewed dynamic face stimuli in a visual memory task.
 
 ## Installation