iw4x-client/.github/pull_request_template.md

**What does this PR do?**

Thanks for the contribution! Please provide a concise description of the problem this request solves.

**How does this PR change IW4x's behaviour?**

Are there any breaking changes? Will any existing behaviour change?
Specify the new expected behaviour if this PR adds a new gameplay feature or alters an existing game mechanic. You may provide an image or video showing the changes.

**Anything else we should know?**

Add any other context about your changes here.

**Did you check all the boxes?**

- [ ] Focus on a single fix or feature; remove any unrelated formatting or code changes
- [ ] Mention any [related issues](https://github.com/XLabsProject/iw4x-client/issues) (put `closes #XXXX` in comment to auto-close issue when PR is merged)
- [ ] Follow our [coding conventions](https://github.com/XLabsProject/iw4x-client/blob/master/CODESTYLE.md)
- [ ] Minimize the number of commits