chore: add pull request template

.github/PULL_REQUEST_TEMPLATE/pull_request_template.md

@@ -0,0 +1,15 @@
+<!--
+Thank you for your pull request. Please provide a description above and review
+the requirements below.
+
+Bug fixes and new features should include tests.
+
+Contributors guide: https://github.com/Fdawgs/node-poppler/blob/master/CONTRIBUTING.md
+
+-->
+
+#### Checklist
+
+-   [ ] Run `npm test`
+-   [ ] Documentation has been updated if needed
+-   [ ] Commit message adheres to the [Conventional commits](https://www.conventionalcommits.org/en/v1.0.0/) style, following the `@commitlint/config-conventional` config