chore(github): add pr template to repo

.github/PULL_REQUEST_TEMPLATE.md

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+<!-- Please refer to our contributing documentation for any questions on submitting a pull request, or let us know here if you need any help: https://github.com/ionic-team/stencil/blob/main/.github/CONTRIBUTING.md -->
+
+## Pull request checklist
+
+Please check if your PR fulfills the following requirements:
+- [ ] Tests for the changes have been added (for bug fixes / features)
+- [ ] Docs have been reviewed and added / updated if needed (for bug fixes / features)
+- [ ] Build (`npm run build`) was run locally and any changes were pushed
+- [ ] Unit tests (`npm test`) were run locally and passed
+
+## Pull request type
+
+<!-- Please do not submit updates to dependencies unless it fixes an issue. --> 
+
+<!-- Please try to limit your pull request to one type, submit multiple pull requests if needed. --> 
+
+Please check the type of change your PR introduces:
+- [ ] Bugfix
+- [ ] Feature
+- [ ] Refactoring (no functional changes, no api changes)
+- [ ] Build related changes
+- [ ] Documentation content changes
+- [ ] Other (please describe):
+
+
+## What is the current behavior?
+<!-- Please describe the current behavior that you are modifying, or link to a relevant issue. -->
+
+GitHub Issue Number: N/A
+
+
+## What is the new behavior?
+<!-- Please describe the behavior or changes that are being added by this PR. -->
+
+-
+-
+-
+
+## Does this introduce a breaking change?
+
+- [ ] Yes
+- [ ] No
+
+<!-- If this introduces a breaking change, please describe the impact and migration path for existing applications below. -->
+
+## Testing
+
+<!-- Please describe the steps you took to test the changes in this PR. -->
+
+## Other information
+
+<!-- Any other information that is important to this PR such as screenshots of how the component looks before and after the change. -->