Started work on #1

TwitchDesktopNotifications/Core/NotifyManager.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using TwitchDesktopNotifications.JsonStructure.Helix;
+
+namespace TwitchDesktopNotifications.Core
+{
+    internal class NotifyManager
+    {
+
+        public Boolean shouldNotify(String streamerName)
+        {
+            return notifyAll || !DataStore.GetInstance().Store.SteamersToNotify.Streamers.Contains(streamerName);
+        }
+
+        public void AddStreamerToNotifyList(String streamerName)
+        {
+            DataStore.GetInstance().Store.SteamersToNotify.Streamers.Add(streamerName);
+            DataStore.GetInstance().Save();
+        }
+
+        public void RemoveStreamerToNotifyList(String streamerName)
+        {
+            DataStore.GetInstance().Store.SteamersToNotify.Streamers.Remove(streamerName);
+            DataStore.GetInstance().Save();
+        }
+
+        public void ClearListOfEnabled()
+        {
+            DataStore.GetInstance().Store.SteamersToNotify.Streamers = new List<string>();
+            DataStore.GetInstance().Save();
+        }
+
+        public bool notifyAll
+        {
+            get
+            {
+                return DataStore.GetInstance().Store.SteamersToNotify.notifyAll;
+            }
+            set { 
+                DataStore.GetInstance().Store.SteamersToNotify.notifyAll = value;
+                DataStore.GetInstance().Save();
+            }
+        }
+    }
+}