Add sultan.is-a.dev record.

domains/sultan.json

@@ -0,0 +1,9 @@
+{
+  "owner": {
+    "username": "kimsultech",
+    "email": "me@sultan.my.id"
+  },
+  "records": {
+    "URL": "https://github.com/kimsultech"
+  }
+}