Add www.nibir.json for domain configuration

domains/www.nibir.json

@@ -0,0 +1,9 @@
+{
+    "owner": {
+        "username": "mahmudnibir",
+        "email": "nibirbbkr@gmail.com"
+    },
+    "records": {
+        "CNAME": "nibirmahmud.netlify.app"
+    }
+}