Create PULL_REQUEST_TEMPLATE.md

.github/PULL_REQUEST_TEMPLATE.md

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+<!-- Please put the status in the PR title e.g. [HOLD], [WIP] -->
+<!-- Statuses: READY/WIP/HOLD -->
+
+## Description
+A few sentences describing the overall goals of the pull request's commits.
+
+## Related PRs
+List related PRs against other branches:
+
+branch | PR
+------ | ------
+other_pr_production | [link]()
+other_pr_master | [link]()
+
+
+## Todos
+- [ ] Tests
+- [ ] Documentation
+- [ ] Changelog Entry (unreleased)
+
+## Steps to Test or Reproduce
+<!-- Outline the steps to test or reproduce the PR here. -->
+
+```bash
+> git pull --prune
+> git checkout <branch>
+> vendor/bin/phpunit
+```
+
+1.