add models

lib/models/index.dart

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+export 'src/media.dart';
+export 'src/response.dart';

lib/models/src/media.dart

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+import 'dart:convert';
+
+import 'package:built_collection/built_collection.dart';
+import 'package:built_value/built_value.dart';
+import 'package:built_value/serializer.dart';
+
+import 'serializers.dart';
+
+part 'media.g.dart';
+
+abstract class Media implements Built<Media, MediaBuilder> {
+  String get id;
+
+  String get caption;
+
+  String get url;
+
+  MediaType get type;
+
+  Media._();
+
+  factory Media([void Function(MediaBuilder) updates]) = _$Media;
+
+  static Media fromJson(String jsonString) {
+    return serializers.fromJson(Media.serializer, jsonString)!;
+  }
+
+  String toJson() {
+    return serializers.toJson(Media.serializer, this);
+  }
+
+  static Serializer<Media> get serializer => _$mediaSerializer;
+}
+
+class MediaType extends EnumClass {
+  static const MediaType image = _$image;
+  static const MediaType video = _$video;
+
+  const MediaType._(super.name);
+
+  static BuiltSet<MediaType> get values => _$values;
+
+  static MediaType valueOf(String name) => _$valueOf(name);
+
+  static Serializer<MediaType> get serializer => _$mediaTypeSerializer;
+}

lib/models/src/response.dart

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+import 'dart:convert';
+
+import 'package:built_collection/built_collection.dart';
+import 'package:built_value/built_value.dart';
+import 'package:built_value/serializer.dart';
+
+import 'media.dart';
+import 'serializers.dart';
+
+part 'response.g.dart';
+
+abstract class Response implements Built<Response, ResponseBuilder> {
+  BuiltList<Media> get medias;
+
+  Response._();
+
+  factory Response([void Function(ResponseBuilder) updates]) = _$Response;
+
+  static Response fromJson(String jsonString) {
+    return serializers.fromJson(Response.serializer, jsonString)!;
+  }
+
+  String toJson() {
+    return serializers.toJson(Response.serializer, this);
+  }
+
+  static Serializer<Response> get serializer => _$responseSerializer;
+}