Create pull_request_template.md

Signed-off-by: Ambika Nair <[email protected]>

Author: ambiknai

template/pull_request_template.md

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+## Describe your changes
+
+## Issue ticket number and link
+
+## Checklist before requesting a review
+- [ ] I have performed a self-review of my code
+- [ ] If it is a core feature, I have added thorough tests.
+- [ ] I have executed all necessary linter and made sure internal pipeline/travis is not broken