docs: add mayank23 as a contributor (testing-library#756)

Co-authored-by: allcontributors[bot] <46447321+allcontributors[bot]@users.noreply.github.com>

Author: allcontributors[bot]

.all-contributorsrc

@@ -1229,6 +1229,15 @@
  "contributions": [
  "doc"
  ]
+ },
+ {
+ "login": "mayank23",
+ "name": "Mayank Jethva",
+ "avatar_url": "https://avatars.githubusercontent.com/u/1103708?v=4",
+ "profile": "http://mayankjethva.xyz",
+ "contributions": [
+ "doc"
+ ]
  }
  ],
  "contributorsPerLine": 7,

README.md

@@ -306,6 +306,7 @@ Thanks goes to these wonderful people ([emoji key](https://allcontributors.org/d
  <tr>
  <td align="center"><a href="https://github.com/prsdta"><img src="https://avatars3.githubusercontent.com/u/19373361?v=4?s=100" width="100px;" alt=""/><br /><sub><b>prsdta</b></sub></a><br /><a href="https://github.com/testing-library/testing-library-docs/commits?author=prsdta" title="Documentation">📖</a></td>
  <td align="center"><a href="https://github.com/tal-joffe"><img src="https://avatars0.githubusercontent.com/u/7221753?v=4?s=100" width="100px;" alt=""/><br /><sub><b>tal-joffe</b></sub></a><br /><a href="https://github.com/testing-library/testing-library-docs/commits?author=tal-joffe" title="Documentation">📖</a></td>
+ <td align="center"><a href="http://mayankjethva.xyz"><img src="https://avatars.githubusercontent.com/u/1103708?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Mayank Jethva</b></sub></a><br /><a href="https://github.com/testing-library/testing-library-docs/commits?author=mayank23" title="Documentation">📖</a></td>
  </tr>
 </table>