nextcloud-server/.github/pull_request_template.md

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* Resolves: # <!-- related github issue -->

## Summary


## TODO

- [ ] ...

## Checklist

- Code is [properly formatted](https://docs.nextcloud.com/server/latest/developer_manual/digging_deeper/continuous_integration.html#linting)
- [Sign-off message](https://github.com/src-d/guide/blob/master/developer-community/fix-DCO.md) is added to all commits
- [ ] Tests ([unit](https://docs.nextcloud.com/server/latest/developer_manual/app_development/tutorial.html#unit-tests), [integration](https://docs.nextcloud.com/server/latest/developer_manual/app_development/tutorial.html#integration-tests), api and/or acceptance) are included
- [ ] Screenshots before/after for front-end changes
- [ ] Documentation ([manuals](https://github.com/nextcloud/documentation/) or wiki) has been updated or is not required
- [ ] [Backports requested](https://github.com/nextcloud/backportbot/#usage) where applicable (ex: critical bugfixes)
- [ ] [Labels added](https://github.com/nextcloud/server/labels) where applicable (ex: bug/enhancement, `3. to review`, feature component)
- [ ] [Milestone added](https://github.com/nextcloud/server/milestones) for target branch/version (ex: 32.x for `stable32`)