docs: update README.md [skip ci]

Author: allcontributors[bot]

README.md

@@ -1161,6 +1161,7 @@ We recognize all types of contributions. This project follows the [all-contribut
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       <td align="center" valign="top" width="16.66%"><a href="https://github.com/shivasankaran18"><img src="https://avatars.githubusercontent.com/u/148421597?v=4?s=64" width="64px;" alt="Shiva"/><br /><sub><b>Shiva</b></sub></a><br /><a href="https://github.com/processing/p5.js/commits?author=shivasankaran18" title="Documentation">📖</a></td>
+      <td align="center" valign="top" width="16.66%"><a href="https://github.com/madhav2348"><img src="https://avatars.githubusercontent.com/u/161720210?v=4?s=64" width="64px;" alt="Madhav Majumdar"/><br /><sub><b>Madhav Majumdar</b></sub></a><br /><a href="https://github.com/processing/p5.js/commits?author=madhav2348" title="Code">💻</a></td>
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