Add authors of demo

Author: peterhgombos

nin.json

@@ -1,7 +1,16 @@
 {
   "title": "Construct",
   "authors": [
-    "Your demoscene handle"
+    "profit",
+    "iverjo",
+    "sigveseb",
+    "run",
+    "eldfor",
+    "lulle",
+    "tr0n",
+    "rohtie",
+    "cristea",
+    "stiaje"
   ],
   "description": "This is my project",
   "previewImage": "https://raw.githubusercontent.com/ninjadev/nin/master/nin/frontend/app/images/nin-dark.png",