Add Vercel configuration for domain verification

domains/_vercel.janzen.json

@@ -0,0 +1,9 @@
+{
+  "owner": {
+    "username": "janzengo",
+    "email": "janneiljanzen.go@gmail.com"
+  },
+  "records": {
+    "TXT": "vc-domain-verify=janzen.is-a.dev,dce5fb1632095abf006c"
+  }
+}