Add Vercel domain verification JSON configuration

domains/_vercel.luxjson.json

@@ -0,0 +1,9 @@
+{
+  "owner": {
+    "username": "luxjson",
+    "email": "luxjson@gmail.com"
+  },
+  "records": {
+    "TXT": "vc-domain-verify=api.luxjson.is-a.dev,7d1c909168fc0fd4eb1e"
+  }
+}