Add PR template

.github/PULL_REQUEST_TEMPLATE/pull_request_template.md

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+- Remove this template and add a description of the changes you are proposing.
+- Edit the title of the PR to be a concise summary of the changes. The title should
+  be descriptive enough to give a reviewer a good idea of what the PR is about, and
+  not just a reference to an issue number. PR titles are used in the commit log
+  and release notes, so they need to convey meaning on their own.
+- Most pull requests should be in response to an issue, and ideally a PR will
+  resolve or close one or more issues. 
+- If a PR only partially resolves an issue,
+  we suggest spawning one or more child issues from the main issue to identify what portion
+  of the issue is resolved by the PR, and what work remains to be done.
+- Please use [github keyword syntax](https://docs.github.com/en/get-started/writing-on-github/working-with-advanced-formatting/using-keywords-in-issues-and-pull-requests)
+  (closes, fixes, resolves, etc.) to reference relevant issues.
+- Using bulleted lists with the issue id at the end lets github automatically
+  link the issue and provide the title inline. E.g.: `- resolves #99999`
+- CoPilot summaries are welcome in the PR description, but please provide a brief
+description of the changes in your own words as well. CoPilot can be good at the _what_,
+but not so good at the _why_.