docs: update README.md [skip ci]

Author: allcontributors[bot]

README.md

@@ -481,6 +481,7 @@ We recognize all types of contributions. This project follows the [all-contribut
     <td align="center"><a href="http://www.joonasjokinen.fi"><img src="https://avatars.githubusercontent.com/u/46967273?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Joonas Jokinen</b></sub></a><br /><a href="#design-jnsjknn" title="Design">🎨</a></td>
     <td align="center"><a href="https://github.com/Ajaya1000"><img src="https://avatars.githubusercontent.com/u/43005088?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Ajaya Mati</b></sub></a><br /><a href="https://github.com/processing/p5.js/commits?author=Ajaya1000" title="Code">💻</a></td>
     <td align="center"><a href="https://github.com/suhascv"><img src="https://avatars.githubusercontent.com/u/43292181?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Suhas CV</b></sub></a><br /><a href="https://github.com/processing/p5.js/commits?author=suhascv" title="Documentation">📖</a></td>
+    <td align="center"><a href="http://sanjaysinghrajpoot.me"><img src="https://avatars.githubusercontent.com/u/67458417?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Sanjay Singh Rajpoot</b></sub></a><br /><a href="https://github.com/processing/p5.js/commits?author=SanjaySinghRajpoot" title="Documentation">📖</a></td>
   </tr>
 </table>