Adding Codecov in Readme [skip ci]

README.md

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 [![License](https://img.shields.io/badge/License-BSD%202--Clause-orange.svg)](https://opensource.org/licenses/BSD-2-Clause)
 [![Paper](https://zenodo.org/badge/DOI/10.1038/s41598-023-42048-7.svg)](https://doi.org/10.1038/s41598-023-42048-7)
 [![codecov](https://codecov.io/gh/raidionics/Raidionics/branch/master/graph/badge.svg?token=ZSPQVR7RKX)](https://codecov.io/gh/raidionics/Raidionics)
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 **Raidionics** was developed by SINTEF Medical Image Analysis. A paper presenting the software and some benchmarks has been published in [Scientific Reports](https://doi.org/10.1038/s41598-023-42048-7).
 
  <img src="assets/images/Preview_SingleUse.gif" width="85%">