PULL_REQUEST_TEMPLATE.md

## Standards checklist:

- [ ] The PR title is descriptive.
- [ ] The PR doesn't replicate another PR which is already open.
- [ ] I have read the contribution guide and followed all the instructions.
- [ ] The code follows the code style guide detailed in the wiki.
- [ ] The code is mine or it's from somewhere with an MIT-compatible license.
- [ ] The code is efficient, to the best of my ability, and does not waste computer resources.
- [ ] The code is stable and I have tested it myself, to the best of my abilities.

## Changes:

- [...]

## Other comments:

...