docs: update README.md

Author: allcontributors[bot]

README.md

@@ -49,6 +49,7 @@ Check [all 41 challenges](https://angular-challenges.vercel.app/)
   <td align="center" valign="top" width="14.28%"><a href="https://nelsonguti.dev/"><img src="https://avatars.githubusercontent.com/u/62297014?v=4?s=100" width="100px;" alt="Nelson Gutierrez"/><br /><sub><b>Nelson Gutierrez</b></sub></a><br /><a href="#translation-es-nelsongutidev" title="Translate in Spanish">🇪🇸</a></td>
   <td align="center" valign="top" width="14.28%"><a href="https://github.com/ho-ssain"><img src="https://avatars.githubusercontent.com/u/61125174?v=4?s=100" width="100px;" alt="Hossain K. M."/><br /><sub><b>Hossain K. M.</b></sub></a><br /><a href="https://github.com/tomalaforge/angular-challenges/commits?author=ho-ssain" title="Documentation">📖</a></td>
   <td align="center" valign="top" width="14.28%"><a href="https://github.com/kabrunko-dev/"><img src="https://avatars.githubusercontent.com/u/142346548?v=4?s=100" width="100px;" alt="Diogo Nishikawa"/><br /><sub><b>Diogo Nishikawa</b></sub></a><br /><a href="#translation-pt-BR-kabrunko-dev" title="Translate in Brazilian Portuguese">🇧🇷</a> <a href="https://github.com/tomalaforge/angular-challenges/commits?author=kabrunko-dev" title="Documentation">📖</a></td>
+  <td align="center" valign="top" width="14.28%"><a href="https://github.com/stillst"><img src="https://avatars.githubusercontent.com/u/1463098?v=4?s=100" width="100px;" alt="stillst"/><br /><sub><b>stillst</b></sub></a><br /><a href="https://github.com/tomalaforge/angular-challenges/commits?author=stillst" title="Code">💻</a></td>
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