Create pull-request-policy.md (#40701)
Create pull-request-policy.md (#40701)

* Create pull-request-validation.md

* Update pull-request-validation.md

* Update pull-request-validation.md

* Update pull-request-validation.md

* Update pull-request-validation.md

* Rename pull-request-validation.md to pull-request-policy.md

* Update pull-request-policy.md

ViktorHofer/corefx,shimingsg/corefx,ericstj/corefx,shimingsg/corefx,shimingsg/corefx,ViktorHofer/corefx,ericstj/corefx,wtgodbe/corefx,ViktorHofer/corefx,ericstj/corefx,ViktorHofer/corefx,shimingsg/corefx,shimingsg/corefx,wtgodbe/corefx,wtgodbe/corefx,ericstj/corefx,ViktorHofer/corefx,ericstj/corefx,ViktorHofer/corefx,wtgodbe/corefx,shimingsg/corefx,shimingsg/corefx,wtgodbe/corefx,ViktorHofer/corefx,wtgodbe/corefx,wtgodbe/corefx,ericstj/corefx,ericstj/corefx