Initial commit

lib/domain/entities/annotation.dart

@@ -0,0 +1,16 @@
+import 'package:freezed_annotation/freezed_annotation.dart';
+
+part 'annotation.freezed.dart';
+
+@freezed
+class AnnotationEntity with _$AnnotationEntity {
+  const factory AnnotationEntity({
+    required String id,
+    required String sessionId,
+    required double startTime,
+    required double endTime,
+    String? name,
+    String? description,
+    String? color,
+  }) = _AnnotationEntity;
+}