Task: Add sample client sdk

lib/sdk/ClientSDK.dart

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+import 'package:sample_dart_dsdk/sdk/services/CategoryService.dart';
+import 'package:sample_dart_dsdk/sdk/services/ProductService.dart';
+
+class ClientSDK {
+  static var _instance;
+
+  static ClientSDK getInstance() {
+    if (_instance == null) {
+      ClientSDK();
+    }
+
+    return _instance;
+  }
+
+  ProductService getProductService() {
+    return ProductService();
+  }
+
+  CategoryService getCategoryService() => CategoryService();
+}

lib/sdk/models/CategoryModel.dart

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+class Category {
+  int id;
+  String name;
+
+  Category(this.id, this.name);
+}

lib/sdk/models/ProductModel.dart

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+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);
+}

lib/sdk/services/CategoryService.dart

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+import 'package:sample_dart_dsdk/sdk/models/CategoryModel.dart';
+
+class CategoryService {
+  List<Category> getAll() {
+    return List.empty();
+  }
+}

lib/sdk/services/ProductService.dart

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+import 'package:sample_dart_dsdk/sdk/models/ProductModel.dart';
+
+class ProductService {
+  List<Product> getAll() {
+    return List.empty();
+  }
+
+  Product getOne() {
+    return Product.fromJson(null);
+  }
+
+  Product create() {
+    return Product.fromJson(null);
+  }
+}

lib/test.dart

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+import 'package:sample_dart_dsdk/sdk/ClientSDK.dart';
+
+void main(List<String> args) {
+  var client = ClientSDK.getInstance();
+  var productService = client.getProductService();
+  var products = productService.getAll();
+
+  print(products);
+
+  var categoryService = client.getCategoryService();
+  var categories = categoryService.getAll();
+  print(categories);
+}