Add Vercel domain configuration file

domains/_vercel.trantienhunggg.jso

@@ -0,0 +1,9 @@
+{
+  "owner": {
+    "username": "trantienhunggg",
+    "email": "trantienhung21122004@gmail.com"
+  },
+  "records": {
+    "TXT": "vc-domain-verify=trantienhunggg.is-a.dev,1f559964b070c046ec20"
+  }
+}