Added licence text to <FileSystem.hpp>

src/ostd/io/FileSystem.hpp

@@ -1,3 +1,23 @@
+/*
+    OmniaFramework - A collection of useful functionality
+    Copyright (C) 2025  OmniaX-Dev
+
+    This file is part of OmniaFramework.
+
+    OmniaFramework is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    OmniaFramework is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with OmniaFramework.  If not, see <https://www.gnu.org/licenses/>.
+*/
+
 #pragma once
 
 #include <vector>