chore: added pull request template

Signed-off-by: András Jáky <ajaky@cisco.com>

Author: akijakya

.github/PULL_REQUEST_TEMPLATE.md

@@ -0,0 +1,21 @@
+<!--
+Thank you for sending a pull request! Here are some tips for contributors:
+
+1. Fill the description template below.
+2. Include appropriate tests (if necessary). Make sure that all CI checks passed.
+3. If the Pull Request is a work in progress, make use of GitHub's "Draft PR" feature and mark it as such.
+-->
+
+## Overview
+
+<!--
+Please include a summary of the changes and the related issue.
+Please also include relevant motivation and context.
+List any dependencies that are required for this change.
+-->
+
+Fixes #(issue)
+
+## Notes for reviewer
+
+<!-- Anything the reviewer should know? -->