docs: add pull request template

.github/PULL_REQUEST_TEMPLATE.md

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+# What is it?
+
+- [ ] Feature / enhancement
+- [ ] Bug
+- [ ] Docs / tests
+
+# Description
+
+Please include a summary of the change and which issue is fixed. Please also include relevant motivation and context. List any dependencies that are required for this change.
+
+# Use cases and why
+
+<!-- Actual / expected behavior if it's a bug -->
+
+- 1. One use case
+- 2. Another use case
+
+# Checklist:
+
+- [ ] My code follows the [developer guidelines of this project](https://github.com/BuilderIO/partytown/blob/main/CONTRIBUTING.md)
+- [ ] I have performed a self-review of my own code
+- [ ] I have made corresponding changes to the documentation
+- [ ] Added new tests to cover the fix / functionality