Add Vercel domain verification configuration

domains/_vercel.adityasinghal.json

@@ -0,0 +1,11 @@
+{
+  "description": "Vercel domain verification for adityasinghal.is-a.dev",
+  "repo": "https://github.com/TheAdityaSinghal/vercel-portfolio",
+  "owner": {
+    "username": "TheAdityaSinghal",
+    "email": "adityaweb101@gmail.com"
+  },
+  "records": {
+    "TXT": "vc-domain-verify=adityasinghal.is-a.dev,0e1d08af4101187d907d"
+  }
+}