INFRA: Set Up Project.

lib/themes/responsive.dart

@@ -0,0 +1,11 @@
+import 'package:flutter/material.dart';
+
+class Responsive {
+  static double width(double size, BuildContext context) {
+    return MediaQuery.of(context).size.width * (size / 100);
+  }
+
+  static double height(double size, BuildContext context) {
+    return MediaQuery.of(context).size.height * (size / 100);
+  }
+}