Add PR template

.github/PULL_REQUEST_TEMPLATE.md

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+Closes #
+
+<!-- If your PR is related to an issue, provide the number(s) above; if it resolves multiple issues, be sure to break them up (e.g. "closes #1000, closes #1001"). -->
+
+<!--
+
+Thank you for contributing to Storybook! Please submit all PRs to the `next` branch unless they are specific to the current release. Storybook maintainers cherry-pick bug and documentation fixes into the `main` branch as part of the release process, so you shouldn't need to worry about this. For additional guidance: https://storybook.js.org/docs/contribute
+
+-->
+
+## What I did
+
+<!-- Briefly describe what your PR does -->
+
+## Checklist for Contributors
+
+#### Manual testing
+
+_This section is mandatory for all contributions. If you believe no manual test is necessary, please state so explicitly. Thanks!_
+
+### Documentation
+
+<!-- Please check (put an "x" inside the "[ ]") the applicable items below to indicate which documentation has been updated. -->
+
+- [ ] Add or update documentation reflecting your changes in this repository
+- [ ] Request documentation updates in the [test-runner docs website](https://storybook.js.org/docs/writing-tests/test-runner)
+
+<!-- Regarding requesting documentation updates, please notify the maintainers of this repo in this PR. -->
+
+## Checklist for Maintainers
+
+- [ ] Make sure this PR contains **one** of the labels below:
+   <details>
+     <summary>Available labels</summary>
+
+  - `skip-release`: Skip any releases, e.g., documentation only changes, CI config etc.
+  - `patch`: Upgrade patch version (e.g. 0.0.x)
+  - `minor`: Upgrade patch version (e.g. 0.x.0)
+  - `major`: Upgrade patch version (e.g. x.0.0)
+
+   </details>