Task: Add sample client sdk

lib/sdk/models/CategoryModel.dart

@@ -0,0 +1,6 @@
+class Category {
+  int id;
+  String name;
+
+  Category(this.id, this.name);
+}

lib/sdk/models/ProductModel.dart

@@ -0,0 +1,20 @@
+class Product {
+  int id;
+  String name;
+  double price;
+
+  Product(this.id, this.name, this.price);
+
+  static Product fromJson(dynamic json) => Product(
+        json['id'],
+        json['name'],
+        json['price'],
+      );
+}
+
+class ProductRequest {
+  String name;
+  double price;
+
+  ProductRequest(this.name, this.price);
+}