seperated todoist and habitica api calls into services

Habitica.Todoist.Integration.Model/Storage/TodoAction.cs

@@ -0,0 +1,14 @@
+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace Habitica.Todoist.Integration.Model.Storage
+{
+    public enum TodoAction
+    {
+        Add = 1,
+        Update = 2,
+        Complete = 3,
+        Delete = 4
+    }
+}