egui/.github/pull_request_template.md

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Closes <https://github.com/emilk/egui/issues/THE_RELEVANT_ISSUE>.
Improve github templates with <!-- comments --> 4 years ago			`<!--`
Add a pull_request_template.md 4 years ago			Please read the "Making a PR" section of [`CONTRIBUTING.md`](https://github.com/emilk/egui/blob/master/CONTRIBUTING.md) before opening a Pull Request!
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PR template: encourage linking to the relevant issue 4 years ago
			`Closes <https://github.com/emilk/egui/issues/THE_RELEVANT_ISSUE>.`