[ADD] slides gallery module

- Task: https://www.odoo.com/web?#id=9093&view_type=form&model=project.task
- Pad: https://pad.odoo.com/p/r.QlQTvBv6mCcMrK4B
is it a wrapper of select2 and change behavior of select2 ? if yes, can you put this stuff into new JS file ?