Changed plugin architecture

Signed-off-by: Erik Bernskiold <erik@xldstudios.com>
Change plugin file architecture

Moved shortcodes to inc folder and removed todolist.

Signed-off-by: Erik Bernskiold <erik@xldstudios.com>
Added GitHub auto-updater support

Signed-off-by: Erik Bernskiold <erik@xldstudios.com>
Added readme file

Signed-off-by: Erik Bernskiold <erik@xldstudios.com>