add _vercel verification file for nirina.json file

domains/_vercel.nirina.json

@@ -0,0 +1,8 @@
+{
+    "owner": {
+        "username": "nirinaRakotoniary"
+    },
+    "records": {
+        "TXT": "vc-domain-verify=nirina.is-a.dev"
+    }
+}