Create PULL_REQUEST_TEMPLATE.md
Create PULL_REQUEST_TEMPLATE.md

First round of adding a pull request template.
Whatthefoxsays/docs,sendgrid/docs,katieporter/docs,Aonepathan/docs,hardikjain29/docs,katieporter/docs,hardikjain29/docs,katieporter/docs,Whatthefoxsays/docs,ksigler7/docs,Aonepathan/docs,katieporter/docs,hardikjain29/docs,Zaftula/docs,katieporter/docs,ksigler7/docs,ksigler7/docs,Zaftula/docs,Aonepathan/docs,hardikjain29/docs,hardikjain29/docs,Zaftula/docs,Aonepathan/docs,Whatthefoxsays/docs,Aonepathan/docs,sendgrid/docs,sendgrid/docs,Zaftula/docs,Zaftula/docs