undo removig core file

Signed-off-by: sergiu <sergiubota@rospace.com>

Author: SergiuBota1

src/Core/src/App/src/InputFilter/AbstractInputFilter.php

@@ -0,0 +1,9 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Core\App\InputFilter;
+
+abstract class AbstractInputFilter
+{
+}