Add PR template

.github/PULL_REQUEST_TEMPLATE.md

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+## Description
+
+*Replace this paragraph with a description of what this PR is doing. If you're modifying existing behavior, describe the existing behavior, how this PR is changing it, and what motivated the change. Consider including before/after screenshots or videos.*
+
+## Related Issues
+
+*Replace this paragraph with a list of issues related to this PR from the [issue database](https://github.com/woltapp/wolt_modal_sheet/issues). Indicate, which of these issues are resolved or fixed by this PR.*
+
+## Checklist
+
+Before you create this PR confirm that it meets all requirements listed below by checking the relevant checkboxes (`[x]`).
+This will ensure a smooth and quick review process.
+
+- [ ] I read the [Contributor Guide] and followed the process outlined there for submitting PRs.
+- [ ] My PR includes tests for *all* changed/updated/fixed behaviors.
+- [ ] All existing and new tests are passing.
+- [ ] I updated/added relevant documentation (doc comments with `///`).
+- [ ] The analyzer (`melos run analyze`) does not report any problems on my PR.
+- [ ] The package compiles with the minimum Flutter version stated in the [pubspec.yaml](https://github.com/woltapp/wolt_modal_sheet/blob/main/pubspec.yaml#L8)
+
+
+## Breaking Change
+
+Does your PR require plugin users to manually update their apps to accommodate your change?
+
+- [ ] Yes, this is a breaking change.
+- [ ] No, this is *not* a breaking change.
+
+<!-- Links -->
+[Contributor Guide]: https://github.com/woltapp/wolt_modal_sheet/blob/main/CONTRIBUTING.md
+