RFR: Create pull request template

Wed Apr 10 17:30:13 UTC 2024

On Wed, 10 Apr 2024 17:09:37 GMT, Jorn Vernee <jvernee at openjdk.org> wrote:

> Create a pull request template. The text of the template will appear as the pull request description when creating a new pull request, and contains basic instructions on how to fill out the PR description, and how to test.

Marked as reviewed by mcimadamore (Reviewer).

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PR Review: https://git.openjdk.org/jextract/pull/233#pullrequestreview-1992308334