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/.tx/config

@@ -0,0 +1,8 @@
+[main]
+host = https://www.transifex.com
+
+[glpi-project-plugin-genericobject.genericobject-pot]
+file_filter = locales/<lang>.po
+source_file = locales/genericobject.pot
+source_lang = en
+type = PO