Add channel (stream) model

lib/models/channel.dart

@@ -0,0 +1,27 @@
+import 'package:json_annotation/json_annotation.dart';
+
+part 'channel.g.dart';
+
+// Twitch Channels (Streams)
+@JsonSerializable(createToJson: false, fieldRename: FieldRename.snake)
+class Channel {
+  final String id;
+  final String userId;
+  final String userLogin;
+  final String userName;
+  final String gameId;
+  final String gameName;
+  final String type;
+  final String title;
+  final int viewerCount;
+  final String startedAt;
+  final String language;
+  final String thumbnailUrl;
+  final List<String> tagIds;
+  final bool isMature;
+
+  Channel(this.id, this.userId, this.userLogin, this.userName, this.gameId, this.gameName, this.type, this.title, this.viewerCount, this.startedAt,
+      this.language, this.thumbnailUrl, this.tagIds, this.isMature);
+
+  factory Channel.fromJson(Map<String, dynamic> json) => _$ChannelFromJson(json);
+}

lib/models/channel.g.dart

@@ -0,0 +1,26 @@
+// GENERATED CODE - DO NOT MODIFY BY HAND
+
+part of 'channel.dart';
+
+// **************************************************************************
+// JsonSerializableGenerator
+// **************************************************************************
+
+Channel _$ChannelFromJson(Map<String, dynamic> json) {
+  return Channel(
+    json['id'] as String,
+    json['user_id'] as String,
+    json['user_login'] as String,
+    json['user_name'] as String,
+    json['game_id'] as String,
+    json['game_name'] as String,
+    json['type'] as String,
+    json['title'] as String,
+    json['viewer_count'] as int,
+    json['started_at'] as String,
+    json['language'] as String,
+    json['thumbnail_url'] as String,
+    (json['tag_ids'] as List<dynamic>).map((e) => e as String).toList(),
+    json['is_mature'] as bool,
+  );
+}