Add Vercel configuration for domain verification

domains/_vercel.keel.json

@@ -0,0 +1,9 @@
+{
+    "owner": {
+        "username": "keelbismark",
+        "email": "dedil001kz@gmail.com"
+    },
+    "records": {
+        "TXT": "vc-domain-verify=keel.is-a.dev,5d638a8067469c99e6a7"
+    }
+}