chore: add pull_request_template.md (#1041)

Signed-off-by: behnazh-w <[email protected]>

Author: behnazh-w

Diff for: .github/pull_request_template.md

@@ -0,0 +1,13 @@
+## Checklist
+<!-- Go over following points. check them with an `x` if they do apply, (they turn into clickable checkboxes once the PR is submitted, so no need to do everything at once)
+
+-->
+
+- [ ] I have reviewed the [contribution guide](../CONTRIBUTING.md).
+- [ ] My PR title and commits follow the [Conventional Commits](https://www.conventionalcommits.org/en/v1.0.0/) convention.
+- [ ] My commits include the "Signed-off-by" line.
+- [ ] I have signed my commits following the instructions provided by [GitHub](https://docs.github.com/en/authentication/managing-commit-signature-verification/signing-commits). Note that we run [GitHub's commit verification](https://docs.github.com/en/authentication/managing-commit-signature-verification/about-commit-signature-verification) tool to check the commit signatures. A green `verified` label should appear next to **all** of your commits on GitHub.
+- [ ] I have selected `staging` as the base branch for my PR.
+- [ ] I have updated the relevant documentation, if applicable.
+- [ ] I have tested my changes and verified they work as expected.
+- [ ] I have referenced the issue(s) this pull request solves.