[ADD] inter_company_rules module

- Internal Task https://www.odoo.com/web#id=6962&view_type=form&model=project.task&action=333&active_id=131
- Pad https://pad.odoo.com/p/r.IOcwt0uWZx1OKJiT
move license into __init__.py and use Odoo SA in copyright.
remove license into other py file