Add Vercel domain verification TXT

domains/_vercel.erin.json

@@ -0,0 +1,9 @@
+{
+  "owner": {
+    "username": "erin20080306",
+    "email": "erin20080306@gmail.com"
+  },
+  "records": {
+    "TXT": "vc-domain-verify=erin.is-a.dev,c2e8d16820cdf9f29a6c"
+  }
+}