pr-template: Add (#19)

.github/PULL_REQUEST_TEMPLATE.md

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+## For New Contributors:
+
+- [ ] Have you followed the guidelines in our [Contributing](https://github.com/danger/golang/blob/main/CONTRIBUTING.md) file?
+- [ ] Have you checked to ensure there aren't other open [Pull Requests](../pulls) for the same update/change?
+- [ ] If it's a non-trivial change, I've linked a new or existing [issue](../issues) to this PR
+- [ ] I have performed a self-review of my code
+- [ ] Does your submission pass existing tests?
+- [ ] Have you written new tests for your new changes, if applicable?
+- [ ] Have you added an explanation of what your changes do and why you'd like us to include them?