Adding pr template for changelogs (#1953)

Co-authored-by: Scott Côté <[email protected]>

Author: DevAOC

.github/pull_request_template.md

@@ -0,0 +1,7 @@
+... a description that explains what, why, and how ...
+
+## Changelog
+
+If this PR will affect change user-facing behaviour, add detailed information about the change here to prompt an AI generated changelog entry.
+
+If no changelog is required, write `no-changelog-required` in square brackets `[]`.