MAPG-115 add new classes to store request data (get, post, session, etc.)

src/Interfaces/Authentication/IUser.php

@@ -0,0 +1,10 @@
+<?php namespace MapGuesser\Interfaces\Authentication;
+
+interface IUser
+{
+    const PERMISSION_NORMAL = 0;
+
+    const PERMISSION_ADMIN = 1;
+
+    public function hasPermission(int $permission): bool;
+}