cherrypick/.github/PULL_REQUEST_TEMPLATE/02_enhance.md

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## What
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## Why
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<!-- なぜそうするのか？ どういう意図なのか？ 何が困っているのか？ -->
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## Additional info (optional)
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## Checklist
- [ ] Read the [contribution guide](https://github.com/kokonect-link/cherrypick/blob/develop/CONTRIBUTING.md)
- [ ] Test working in a local environment
- [ ] (If needed) Update CHANGELOG_CHERRYPICK.md
- [ ] (If possible) Add tests