feat(github): add pull request template

.github/pull_request_template.md

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+# Description
+
+Please provide a paragraph or two giving a summary of the change, including relevant motivation and context.
+
+# Checklist:
+
+- [ ] I have reviewed my diff in github, line by line.
+- [ ] Every change is related to the PR description.
+- [ ] I have [linked](https://docs.github.com/en/issues/tracking-your-work-with-issues/linking-a-pull-request-to-an-issue) this pull request to the issue(s) that it resolves.
+- [ ] There are no unexpected formatting changes, superfluous debug logs, or commented-out code.
+- [ ] There are no circuit changes, OR specifications in `/markdown/specs` have been updated.
+- [ ] There are no circuit changes, OR a cryptographer has been assigned for review.
+- [ ] I've updated any terraform that needs updating (e.g. environment variables) for deployment.
+- [ ] The branch has been rebased against the head of its merge target.
+- [ ] I'm happy for the PR to be merged at the reviewer's next convenience.
+- [ ] New functions, classes, etc. have been documented according to the doxygen comment format. Classes and structs must have `@brief` describing the intended functionality.
+- [ ] If existing code has been modified, such documentation has been added or updated.