🎨 Use feature based folder structure

lib/core/services/responsive.dart

@@ -0,0 +1,17 @@
+import 'package:flutter/widgets.dart';
+
+const kWideScreenWidth = 768.0;
+const kWiderScreenWidth = 1024.0;
+const kWidescreenWidth = 1280.0;
+
+bool isWideScreen(BuildContext context) {
+  return MediaQuery.of(context).size.width > kWideScreenWidth;
+}
+
+bool isWiderScreen(BuildContext context) {
+  return MediaQuery.of(context).size.width > kWiderScreenWidth;
+}
+
+bool isWidestScreen(BuildContext context) {
+  return MediaQuery.of(context).size.width > kWidescreenWidth;
+}