chore: add testing and context in PR template (#1966)

Author: trivikr

.github/pull_request_template.md

@@ -0,0 +1,14 @@
+### Issue #
+Refs: #, if available
+
+### Description
+What does this implement/fix? Explain your changes.
+
+### Testing
+How was this change tested?
+
+### Additional context
+Add any other context about the PR here.
+
+---
+By submitting this pull request, I confirm that you can use, modify, copy, and redistribute this contribution, under the terms of your choice.