add vercel verification file

domains/_vercel.aditya-thakur.json

@@ -0,0 +1,11 @@
+{
+  "description": "Vercel verification for aditya-thakur",
+  "repo": "https://github.com/aditya0563/portfolio/tree/main",
+  "owner": {
+    "username": "aditya0563",
+    "email": "taditiya870@gmail.com"
+  },
+  "records": {
+    "TXT": "vc-domain-verify=aditya-thakur.is-a.dev"
+  }
+}