Create pull_request_template.md

Author: phip1611

.github/templates/pull_request_template.md

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+*Descriptive Summary of your Bugfix, Feature, or Refactoring.*
+
+## List of Added or Changed Components
+- feature a added to module bar
+- bug b fixed in foo.rs
+
+## Open Questions
+- [ ] should I go with solution A or B?
+
+## Checklist
+- [ ] sensible git history (we are not too strict, but multiple "typo" or "fix" commits are not okay)
+- [ ] updated the changelog (if necessary)