Add PR template

.github/PULL_REQUEST_TEMPLATE.md

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+Filling out the template is required. Any pull request that does not include enough information to be reviewed in a timely manner may be closed at the maintainers' discretion.
+
+
+> 💡 Please take note of our [contributing guidelines](https://github.com/abordage/.github/blob/master/CONTRIBUTING.md)
+
+1. Why should it be added? What are the benefits of this change?
+2. Does it contain multiple, unrelated changes? Please separate the PRs out.
+3. Does it include tests, if possible?
+4. Any drawbacks? Possible breaking changes?
+
+**Mark the following tasks as done:**
+- [ ] Checked the codebase to ensure that your feature doesn't already exist.
+- [ ] Take note of the contributing guidelines.
+- [ ] Checked the pull requests to ensure that another person hasn't already submitted a fix.
+- [ ] Added tests to ensure against regression.
+- [ ] Updated the changelog
+
+### Thanks for contributing!