chore: add pr template

.github/pull_request_template.md

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+### Description
+
+Write an explicit description about what the PR changes, and how you implemented
+the change.
+
+The quality of the description directly impacts the quality of the review
+process for everyone. Adding relevant context (i.e. describing the reasons for
+the change, adding links to relevant documents, etc) to your description ensures
+that everyone is able to easily gather the context necessary to review your
+change.
+
+### Important points for reviewers
+
+Add some additional resources that could help the reviewer with the
+review. Like link to specs if implementing a protocol.
+
+### Checklist
+
+- [ ] Are there important points that reviewers should know?
+  - [ ] If yes, which ones?
+- [ ] Make sure that you described what this change does.
+- [ ] If there are follow-ups, have you created issues for them?
+  - [ ] If yes, which ones? / List them here
+- [ ] Have you tested this solution?
+- [ ] Were there any alternative implementations considered?
+- [ ] Did you document new (or modified) APIs?