add basic create and list reminder api

Budet-cho-bot/Services/ReminderService.cs

@@ -0,0 +1,44 @@
+using Budet_cho_bot.Helpers;
+using Budet_cho_bot.Models;
+using Budet_cho_bot.Repositories;
+using Discord;
+using Discord_Bot;
+using Newtonsoft.Json.Linq;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Budet_cho_bot.Services
+{
+    internal class ReminderService
+    {
+        private readonly CronRepository _cronRepository = new CronRepository();
+        private const long DAY_PERIOD = 24 * 60 * 60 * 1000; // 10 * 1000; // 
+        private Timer reminderTimer;
+
+
+        public async void SendReminder(object? state)
+        {
+            var users = Functions.GetConfigItem("users").ToString();
+            //await ReplyAsync($"{users}\nБудет чо?");
+        }
+
+        public async Task<int> CreateTask(CronRecord record)
+        {
+            var cron = await _cronRepository.GetCronTask("reminder");
+            var cronUnpacked = Utility.UnpackTimetableFromString(cron);
+            
+            var result = await _cronRepository.SetCronTask("reminder", Utility.PackTimetableIntoString(cronUnpacked.Append(record).ToArray()));
+            return result;
+        }
+
+        public async Task<CronRecord[]> GetTasks()
+        {
+            var cron = await _cronRepository.GetCronTask("reminder");
+            var cronUnpacked = Utility.UnpackTimetableFromString(cron);
+            return cronUnpacked;
+        }
+    }
+}