docs: update README.md

README.md

@@ -67,6 +67,7 @@ Check [all 55 challenges](https://angular-challenges.vercel.app/)
       <td align="center" valign="top" width="14.28%"><a href="https://github.com/alannelucq"><img src="https://avatars.githubusercontent.com/u/44091408?v=4?s=100" width="100px;" alt="Arthur LANNELUCQ"/><br /><sub><b>Arthur LANNELUCQ</b></sub></a><br /><a href="#translation-fr-alannelucq" title="Translate in French">🇫🇷</a></td>
       <td align="center" valign="top" width="14.28%"><a href="https://github.com/fixedmichal"><img src="https://avatars.githubusercontent.com/u/26270192?v=4?s=100" width="100px;" alt="fixed_michal"/><br /><sub><b>fixed_michal</b></sub></a><br /><a href="https://github.com/tomalaforge/angular-challenges/issues?q=author%3Afixedmichal" title="Bug reports">🐛</a></td>
       <td align="center" valign="top" width="14.28%"><a href="https://github.com/Tenessy"><img src="https://avatars.githubusercontent.com/u/65855673?v=4?s=100" width="100px;" alt="Tenessy"/><br /><sub><b>Tenessy</b></sub></a><br /><a href="https://github.com/tomalaforge/angular-challenges/issues?q=author%3ATenessy" title="Bug reports">🐛</a></td>
+      <td align="center" valign="top" width="14.28%"><a href="https://github.com/tsironis13"><img src="https://avatars.githubusercontent.com/u/7561447?v=4?s=100" width="100px;" alt="Tsironis Ioannis"/><br /><sub><b>Tsironis Ioannis</b></sub></a><br /><a href="https://github.com/tomalaforge/angular-challenges/commits?author=tsironis13" title="Code">💻</a></td>
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