Add author profiles

authors.json

 {
   "nik": {
     "display_name": "Dominik George"
+  },
+  "pinguin": {
+    "display_name": "Pingu"
+  },
+  "krfl9500": {
+    "display_name": "Florian Kroker"
+  },
+  "tuxilio": {
+    "display_name": "Tuxilio"
   }
 }