Create contribution1.json

Adding my showcase submission!

Author: HilmiZul

content/videos/ml5/hand-pose/showcase/contribution1.json

@@ -0,0 +1,9 @@
+{
+  "title": "PONG with Hand Pose",
+  "url": "https://pong.zulhilmi.id",
+  "author": {
+    "name": "Zul Hilmi",
+    "url": "https://www.zulhilmi.id"
+  },
+  "submittedOn": "2026-06-27"
+}