Create _vercel.pranavprasad.json for domain verification

Add Vercel TXT verification configuration for domain.

domains/_vercel.pranavprasad.json

@@ -0,0 +1,11 @@
+{
+  "description": "Vercel TXT Verification",
+  "repo": "https://github.com/Pranav-Prasad12/my-portfolio",
+  "owner": {
+    "username": "Pranav-Prasad12",
+    "email": "pranavkarthika12@gmail.com"
+  },
+  "records": {
+    "TXT": "vc-domain-verify=pranavprasad.is-a.dev,e677e8cab523dd2e356b"
+  }
+}