Add Vercel configuration for domain verification

domains/_vercel.shubhamkumar.json

@@ -0,0 +1,9 @@
+{
+    "owner": {
+        "username": "SHUBHAMKUMAR45",
+        "email": "Shubhamkumar2062004@gmail.com"
+    },
+    "records": {
+        "TXT": "vc-domain-verify=shubhamkumar.is-a.dev,843c1c6f9b239ae5df73"
+    }
+}