Create pull_request_template.md

.github/pull_request_template.md

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+<!-- Note which issues are linked to this pull request (PR) -->
+<!-- If this PR is enough to close them you can write something like "Closes #10 and closes #12" -->
+<!-- If you just want to reference them without closing them, you can add something like "References #10" -->
+Closes #
+
+<!-- Add a short description of the PR here - what you have changed and why -->
+
+## Proposed Changes
+<!-- List major changes here, so that the reviewers can have a bit more context -->
+  -
+  -
+  -
+
+## Checklist before review:
+<!-- You're invited to open a draft PR so people can see what you are working on sooner -->
+- [ ] Please comment on my PR while it's a draft and give me feedback on the development!
+- [ ] I added everything I wanted to add to this PR, please review!
+- [ ] The title of this PR is clear and self-explantory.
+- [ ] I added any appropriate labels to this PR.