github: add issue and pull request templates
Fix: #5246 (closed)
See: https://github.com/blog/2111-issue-and-pull-request-templates
cc @nodejs/ctc
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
Fix: #5246 (closed)
See: https://github.com/blog/2111-issue-and-pull-request-templates
cc @nodejs/ctc