Add Vercel domain verification configuration

domains/_vercel.leolb.json

@@ -0,0 +1,9 @@
+{
+    "owner": {
+        "username": "leolb-29",
+        "email": "postyourbot@gmail.com"
+    },
+    "records": {
+        "TXT": "vc-domain-verify=leolb.is-a.dev,a38bc5af4fd29ce592fb"
+    }
+}