feat:初始化工程

lib/models/task.dart

@@ -0,0 +1,24 @@
+class Task {
+  final String id;
+  String title;
+  String? description;
+  DateTime createdAt;
+  DateTime? dueDate;
+  bool isCompleted;
+  Priority priority;
+  String? category;
+
+  Task({
+    String? id,
+    required this.title,
+    this.description,
+    DateTime? createdAt,
+    this.dueDate,
+    this.isCompleted = false,
+    this.priority = Priority.medium,
+    this.category,
+  }) : id = id ?? DateTime.timestamp().microsecond.toString(),
+        createdAt = createdAt ?? DateTime.now();
+}
+
+enum Priority { low, medium, high }