Add Vercel configuration for domain verification

domains/_vercel.hoaau.json

@@ -0,0 +1,9 @@
+{
+    "owner": {
+        "username": "sunwane",
+        "email": "auxuanhoa@gmail."
+    },
+    "records": {
+        "TXT": "vc-domain-verify=www.hoaau.is-a.dev,be99a61cb84de2e5353c"
+    }
+}