Add GenericObject plugin files and assets

- Introduced default icon images in PNG and SVG formats.
- Added example icons for car and cube in SVG format.
- Created setup file for the GenericObject plugin with versioning and directory definitions.
- Included a header file with licensing information for the plugin.
- Added a remove.txt file with instructions for safe deletion.

plugins/genericobject/tools/HEADER

@@ -0,0 +1,25 @@
+-------------------------------------------------------------------------
+GenericObject plugin for GLPI
+-------------------------------------------------------------------------
+
+LICENSE
+
+This file is part of GenericObject.
+
+GenericObject 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.
+
+GenericObject 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 GenericObject. If not, see <http://www.gnu.org/licenses/>.
+-------------------------------------------------------------------------
+@copyright Copyright (C) 2009-2022 by GenericObject plugin team.
+@license   GPLv3 https://www.gnu.org/licenses/gpl-3.0.html
+@link      https://github.com/pluginsGLPI/genericobject
+-------------------------------------------------------------------------