add pull request template to integrate with prow release-note plugin

.github/pull_request_template.md

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+# Changes
+
+<!-- 🎉🎉🎉 Thank you for the PR!!! 🎉🎉🎉 -->
+
+<!-- Describe your changes here- ideally you can get that description straight from
+your descriptive commit message(s)! -->
+
+# Submitter Checklist
+
+See [the contribution guide](https://github.com/shipwright-io/build/blob/master/CONTRIBUTING.md)
+for details on coding conventions, github and prow interactions, and the code reivew process.
+
+# Release Notes
+
+<!--
+Describe any user facing changes here, or delete this block.
+
+Examples of user facing changes:
+- API changes
+- Bug fixes
+- Any changes in behavior
+- Changes requiring upgrade notices or deprecation warnings
+
+For pull requests with a release note:
+
+```release-note
+Your release note here
+```
+
+For pull requests that require additional action from users switching to the new release, include the string "action required" (case insensitive) in the release note:
+
+```release-note
+action required: your release note here
+```
+
+For pull requests that don't need to be mentioned at release time, use the `/release-note-none` Prow command to add the `release-note-none` label to the PR. You can also write the string "NONE" as a release note in your PR description:
+
+```release-note
+NONE
+```
+-->