chore: add pull request template

.github/PULL_REQUEST_TEMPLATE.md

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+### Type of change
+
+<!-- What types of changes does your code introduce? Put an `x` in all the boxes that apply. -->
+
+- [ ] Documentation (updates to the documentation, readme or JSDoc annotations)
+- [ ] Bug fix (a non-breaking change that fixes an issue)
+- [ ] Enhancement (improving an existing functionality like performance)
+- [ ] New feature (a non-breaking change that adds functionality)
+- [ ] Chore (updates to the build process or auxiliary tools and libraries)
+- [ ] Breaking change (fix or feature that would cause existing functionality to change)
+
+### Description
+
+<!-- Describe your changes in detail -->
+<!-- If it resolves an open issue, please link to the issue here. For example "Resolves #1337" -->
+
+### Checklist
+
+<!-- Put an `x` in all the boxes that apply. -->
+
+- [ ] My code follows the code style of the project *(using `pnpm lint` and `pnpm lint --fix`)*