Merge pull request 'add interface IAuthenticationRequired' (#4) from feature/interface-for-authentication-required into master

Reviewed-on: #4

src/Interfaces/Authentication/IAuthenticationRequired.php

@@ -0,0 +1,6 @@
+<?php namespace SokoWeb\Interfaces\Authentication;
+
+interface IAuthenticationRequired
+{
+    public function isAuthenticationRequired(): bool;
+}