feat:增加日程模块

lib/provider/calendar_provider.dart

@@ -0,0 +1,25 @@
+import 'package:flisp_app/models/calendar.dart';
+import 'package:flutter/material.dart';
+
+class CalendarProvider with ChangeNotifier {
+  late Calendar _formItem;
+
+  Calendar get formItem => _formItem;
+
+  void resetForm() {
+    _formItem = Calendar.getEmpty();
+    notifyListeners();
+  }
+
+  void initForm(Calendar calendar) {
+    _formItem = calendar;
+    notifyListeners();
+  }
+
+  void initFormByDate(DateTime date) {
+    _formItem = Calendar.getEmpty();
+    _formItem.startTime = date;
+    _formItem.endTime = date.add(Duration(minutes: 30));
+    notifyListeners();
+  }
+}