docs: update README.md [skip ci]

Author: allcontributors[bot]

README.md

@@ -352,6 +352,7 @@ Thanks goes to these wonderful people ([emoji key](https://allcontributors.org/d
     <td align="center"><a href="https://github.com/asvsfs"><img src="https://avatars.githubusercontent.com/u/119840?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Amir</b></sub></a><br /><a href="https://github.com/ml5js/ml5-library/commits?author=asvsfs" title="Code">💻</a> <a href="#example-asvsfs" title="Examples">💡</a></td>
     <td align="center"><a href="http://lindapaiste.com"><img src="https://avatars.githubusercontent.com/u/28965286?v=4?s=100" width="100px;" alt=""/><br /><sub><b>lindapaiste</b></sub></a><br /><a href="https://github.com/ml5js/ml5-library/commits?author=lindapaiste" title="Code">💻</a> <a href="#ideas-lindapaiste" title="Ideas, Planning, & Feedback">🤔</a> <a href="https://github.com/ml5js/ml5-library/issues?q=author%3Alindapaiste" title="Bug reports">🐛</a></td>
     <td align="center"><a href="http://evanweinberg.com"><img src="https://avatars.githubusercontent.com/u/1531831?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Evan Weinberg</b></sub></a><br /><a href="https://github.com/ml5js/ml5-library/commits?author=emwdx" title="Documentation">📖</a></td>
+    <td align="center"><a href="https://youtube.com/codergautam"><img src="https://avatars.githubusercontent.com/u/66850133?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Coder Gautam</b></sub></a><br /><a href="https://github.com/ml5js/ml5-library/commits?author=codergautam" title="Documentation">📖</a></td>
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 </table>