enso/.github/PULL_REQUEST_TEMPLATE.md

### Pull Request Description

<!--
- Please describe the nature of your PR here, as well as the motivation for it.
- If it fixes an open issue, please mention that issue number here.
-->

### Important Notes

<!--
- Mention important elements of the design.
- Mention any notable changes to APIs.
-->

### Checklist

Please include the following checklist in your PR:

- [ ] The documentation has been updated if necessary.
- [ ] All code conforms to the
      [Scala](https://github.com/enso-org/enso/blob/develop/docs/style-guide/scala.md),
      [Java](https://github.com/enso-org/enso/blob/develop/docs/style-guide/java.md),
      and
      [Rust](https://github.com/enso-org/enso/blob/develop/docs/style-guide/rust.md)
      style guides.
- All code has been tested:
  - [ ] Unit tests have been written where possible.
  - [ ] If GUI codebase was changed: Enso GUI was tested when built using BOTH
        `./run ide build` and `./run ide watch`.