add _vercel TXT record for Vercel domain verification

domains/_vercel.hikmetsuicmez.json

@@ -0,0 +1,9 @@
+{
+  "owner": {
+    "username": "hikmetsuicmez",
+    "linkedin": "hikmetsuicmez"
+  },
+  "records": {
+    "TXT": ["vc-domain-verify=hikmetsuicmez.is-a.dev,62c2850ea5104744e973", "vc-domain-verify=www.hikmetsuicmez.is-a.dev,420dce0ed9334dfaaf35"]
+  }
+}