Add/repo templates

[jeffpaul]

Description of the Change

This PR adds in three Issue templates and a Pull Request template.

Alternate Designs

Keep as-is with no templates for newly submitted issues and PRs.

Benefits

Ensures that you attempt to gather similar, standard input from new bug, enhancement, and question issues as well as specific detail on PRs.

Possible Drawbacks

Theoretically additional work from issue and PR submitters, but assuming these templates are followed it dramatically increases the quality of information coming into the project maintainers.

Verification Process

Manually verified via VS Code and GitHub Desktop UI.

Checklist:

• [ ] My code follows the code style of this project.
• [x] My change requires a change to the documentation.
• [x] I have updated the documentation accordingly.
• [ ] I have added tests to cover my change.
• [ ] All new and existing tests passed.

Applicable Issues

none identified

Changelog Entry

### Added
- Repository management tooling via Issue and PR templates (props [@jeffpaul](https://github.com/jeffpaul/)).