Add stale.yml to enable stalebot (#1508)
Add stale.yml to enable stalebot (#1508)

* Resovles #1507
* Start with marking at 365 days of inactivity

Signed-off-by: Devin Petersohn <9526cbaf745870a4c947dfa2bd5208403b463ac3@gmail.com>
modin-project/modin,modin-project/modin