docs: add Christian24 as a contributor for code, and review (#534)

Author: allcontributors[bot]

.all-contributorsrc

@@ -437,6 +437,16 @@
       "contributions": [
         "code"
       ]
+    },
+    {
+      "login": "Christian24",
+      "name": "Christian24",
+      "avatar_url": "https://avatars.githubusercontent.com/u/2406635?v=4",
+      "profile": "https://github.com/Christian24",
+      "contributions": [
+        "code",
+        "review"
+      ]
     }
   ],
   "contributorsPerLine": 7,

README.md

@@ -275,6 +275,7 @@ Thanks goes to these people ([emoji key][emojis]):
       <td align="center" valign="top" width="14.28%"><a href="https://arthurpetrie.com"><img src="https://avatars.githubusercontent.com/u/16376476?v=4?s=100" width="100px;" alt="Arthur Petrie"/><br /><sub><b>Arthur Petrie</b></sub></a><br /><a href="https://github.com/testing-library/angular-testing-library/commits?author=Arthie" title="Code">💻</a></td>
       <td align="center" valign="top" width="14.28%"><a href="https://github.com/FabienDehopre"><img src="https://avatars.githubusercontent.com/u/97023?v=4?s=100" width="100px;" alt="Fabien Dehopré"/><br /><sub><b>Fabien Dehopré</b></sub></a><br /><a href="https://github.com/testing-library/angular-testing-library/commits?author=FabienDehopre" title="Code">💻</a></td>
       <td align="center" valign="top" width="14.28%"><a href="https://github.com/jvereecken"><img src="https://avatars.githubusercontent.com/u/108937550?v=4?s=100" width="100px;" alt="Jamie Vereecken"/><br /><sub><b>Jamie Vereecken</b></sub></a><br /><a href="https://github.com/testing-library/angular-testing-library/commits?author=jvereecken" title="Code">💻</a></td>
+      <td align="center" valign="top" width="14.28%"><a href="https://github.com/Christian24"><img src="https://avatars.githubusercontent.com/u/2406635?v=4?s=100" width="100px;" alt="Christian24"/><br /><sub><b>Christian24</b></sub></a><br /><a href="https://github.com/testing-library/angular-testing-library/commits?author=Christian24" title="Code">💻</a> <a href="https://github.com/testing-library/angular-testing-library/pulls?q=is%3Apr+reviewed-by%3AChristian24" title="Reviewed Pull Requests">👀</a></td>
     </tr>
   </tbody>
 </table>