Add: getting products from API

lib/interfaces/items.dart

@@ -0,0 +1,80 @@
+import 'dart:convert';
+
+class GymItem {
+  final String id;
+  final String externalId;
+  final String title;
+  final String description;
+  final int count;
+  final double price;
+  final String categoryId;
+  final List<GymImage> images;
+  int localCount = 0;
+
+  GymItem({
+    required this.id,
+    required this.externalId,
+    required this.title,
+    required this.description,
+    required this.count,
+    required this.price,
+    required this.categoryId,
+    required this.images,
+  });
+
+  factory GymItem.fromRawJson(String str) => GymItem.fromJson(json.decode(str));
+
+  String toRawJson() => json.encode(toJson());
+
+  factory GymItem.fromJson(Map<String, dynamic> json) => GymItem(
+        id: json["id"],
+        externalId: json["ExternalId"],
+        title: json["title"],
+        description: json["description"],
+        count: json["count"],
+        price: json["price"] / 100,
+        categoryId: json["categoryId"],
+        images: List<GymImage>.from(
+            json["images"].map((x) => GymImage.fromJson(x))),
+      );
+
+  Map<String, dynamic> toJson() => {
+        "id": id,
+        "ExternalId": externalId,
+        "title": title,
+        "description": description,
+        "count": count,
+        "price": price * 100,
+        "categoryId": categoryId,
+        "images": List<dynamic>.from(images.map((x) => x.toJson())),
+      };
+}
+
+class GymImage {
+  final String id;
+  final dynamic deletedAt;
+  final String url;
+
+  GymImage({
+    required this.id,
+    required this.deletedAt,
+    required this.url,
+  });
+
+  factory GymImage.fromRawJson(String str) =>
+      GymImage.fromJson(json.decode(str));
+
+  String toRawJson() => json.encode(toJson());
+
+  factory GymImage.fromJson(Map<String, dynamic> json) => GymImage(
+        id: json["id"],
+        deletedAt: json["deletedAt"],
+        url: json["url"],
+      );
+
+  Map<String, dynamic> toJson() => {
+        "id": id,
+        "deletedAt": deletedAt,
+        "url": url,
+      };
+}