changes: _rev_

### Proposed Changes

- Added PR template with test instructions

### Checklist

- [ ] I have added or updated unit tests
- [ ] I have added or updated integration tests (if appropriate)
- [ ] I have added or updated documentation (if appropriate)
- [ ] I have verified that my changes have not introduced new lint errors
- [ ] I have updated the change log

### Testing Instructions

```
$ npm run test
```

For unit tests only:

```
$ npm run test-unit
```