made task creation flow

refilc/lib/models/self_note.dart

@@ -33,3 +33,37 @@ class SelfNote {
         'note_type': noteType == NoteType.image ? 'image' : 'text',
       };
 }
+
+class TodoItem {
+  String id;
+  String title;
+  String content;
+  bool done;
+
+  Map? json;
+
+  TodoItem({
+    required this.id,
+    required this.title,
+    required this.content,
+    required this.done,
+    this.json,
+  });
+
+  factory TodoItem.fromJson(Map json) {
+    return TodoItem(
+      id: json['id'],
+      title: json['title'],
+      content: json['content'],
+      done: json['done'],
+      json: json,
+    );
+  }
+
+  get toJson => {
+        'id': id,
+        'title': title,
+        'content': content,
+        'done': done,
+      };
+}