docs: add Ferdinand Malcher to GDE resources (#34694)

PR Close #34694

aio/content/marketing/contributors.json

@@ -829,5 +829,13 @@
     "website": "https://thekiba.io",
     "bio": "Andrew is a software engineer using Angular and .NET. He spends most of his spare time staying up-to-date, helping other people, and experimenting with web tech.",
     "groups": ["GDE"]
+  },
+  "fmalcher": {
+    "name": "Ferdinand Malcher",
+    "picture": "fmalcher.jpg",
+    "twitter": "fmalcher01",
+    "website": "https://angular.schule",
+    "bio": "Ferdinand is a developer, trainer, and international speaker from Leipzig, Germany. He is co-author of the German Angular book and loves to share knowledge – that's why he writes books and blog posts, speaks at meetups and conferences, does Angular training and works as a consultant in his company \"Angular.Schule\".",
+    "groups": ["GDE"]
   }
 }