CI: Add template for pull request (#5453)

.github/pull_request_template.md

@@ -0,0 +1,14 @@
+## Description
+**Please provide a brief description of the changes made in this pull request.**
+
+## Issue linked
+**Please mention the issue number or describe the problem this pull request addresses.**
+
+## Checklist
+- [ ] I have tested my changes locally.
+- [ ] I have added necessary documentation or updated existing documentation.
+- [ ] I have followed the coding style guidelines of this project.
+- [ ] I have added appropriate tests (unit, integration, system).
+- [ ] I have reviewed my changes before submitting this pull request.
+- [ ] I have linked the issue or issues that are solved by the PR if any.
+- [ ] I have agreed with the Contributor License Agreement ([CLA](https://developer.ansys.com/form/cla-acceptance)).