Added pull request template

.github/pull_request_template.md

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+<!--
+	Thank you for your contribution to passkit-generator.
+	You'll be responded to as soon as possible. (but I
+	assure you will be responded! 😉)
+
+	Meanwhile, what about leaving a ⭐️ on the project? That
+	would be very helpful for making it even more known. 🔝
+-->
+
+## Description
+
+<!--
+	Write here below a description about what you are trying to change.
+	Also include, if needed, any information about the platform you tested on.
+
+	If this pull request attempts to close an already opened issue, use issue
+	linkers identifiers like "Fixes #99", to link it automatically. See the
+	identifiers at the following page:
+	https://docs.github.com/en/issues/tracking-your-work-with-issues/linking-a-pull-request-to-an-issue
+-->
+
+## Check relevant checkboxes
+
+-   [ ] I've run tests (through `npm test`) and they passed
+-   [ ] I generated a working Apple Wallet Pass after the change
+-   [ ] Provided examples keep working after the change
+-   [ ] This improvement is or might be a breaking change
+
+## Relevant information
+
+<!-- Add any other relevant details to the PR (test, technical details, ...) -->