add _vercel.ujjwalsinghal.json for Vercel domain verification

domains/_vercel.ujjwalsinghal.json

@@ -0,0 +1,9 @@
+{
+    "owner": {
+        "username": "ujjwal8880",
+        "email": "ujjwalsinghal19@gmail.com"
+    },
+    "records": {
+        "TXT": "vc-domain-verify=is-a.dev,d08c2b2df2f2aaf74d96"
+    }
+}