Add Vercel configuration for domain verification

domains/_vercel.tuman.json

@@ -0,0 +1,9 @@
+{
+  "owner": {
+    "username": "tumansutradhar",
+    "email": "officialbishalsutradhar@gmail.com"
+  },
+  "records": {
+    "TXT": "vc-domain-verify=tuman.is-a.dev,f6ac19319ec5cdec7d23"
+  }
+}