Add PR templates (#11)

.github/PULL_REQUEST_TEMPLATE/release.md

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+## Pull Request
+* [ ] Verify all tests are passing
+* [ ] Update the version in seismometer._version.py
+* [ ] Call towncrier to draft the update to the release notes.  Delete fragments as needed.
+<!--  Do any manual release testing and review here -->
+* [ ] Work with the Core team to get approvals
+* [ ] Squash merge the release pull request with message "`Release <VERSION>`"
+
+## Post Merge
+* [ ] Tag the commit with the matching version vX.Y.Z
+* [ ] Create a release from this tag
+* [ ] If done prior to a deploy workflow, work with the Core team to publish to PyPI.
+* [ ] Make announcement.

.github/pull_request_template.md

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+# Overview
+<!-- Update and delete as appropriate; useful reference when you get to news fragments -->
+Closes #xxx 
+
+## Description of changes
+<!-- Describe your changes and any implementation decisions -->
+<!-- Especially for enhancements, start conversations early. Ideally in the documenting issue -->
+<!-- Can be formatted as a checklist for reviewers. -->
+
+## Author Checklist
+- [ ] Linting passes; run early with [pre-commit hook](https://pre-commit.com/#install).
+- [ ] Tests added for new code and issue being fixed.
+- [ ] Added type annotations and full numpy-style docstrings for new methods.
+- [ ] Draft your news fragment in new `changelog/ISSUE.TYPE.rst` files; see [changelog/README.md](https://github.com/epic-open-source/seismometer/blob/main/changelog/README.md).