chore: add template for new pull requests (#3831)

Co-authored-by: Ari Perkkiö <[email protected]>
Co-authored-by: Anjorin Damilare <[email protected]>

.github/PULL_REQUEST_TEMPLATE.md

@@ -0,0 +1,19 @@
+### Description
+
+<!-- Please insert your description here and provide especially info about the "what" this PR is solving -->
+
+<!-- You can also add additional context here -->
+
+### Please don't delete this checklist! Before submitting the PR, please make sure you do the following:
+- [ ] It's really useful if your PR references an issue where it is discussed ahead of time. If the feature is substantial or introduces breaking changes without a discussion, PR might be closed.
+- [ ] Ideally, include a test that fails without this PR but passes with it.
+- [ ] Please, don't make changes to `pnpm-lock.yaml` unless you introduce a new test example.
+
+### Tests
+- [ ] Run the tests with `pnpm test:ci`.
+
+### Documentation
+- [ ] If you introduce new functionality, document it. You can run documentation with `pnpm run docs` command.
+
+### Changesets
+- [ ] Changes in changelog are generated from PR name. Please, make sure that it explains your changes in an understandable manner. Please, prefix changeset messages with `feat:`, `fix:`, `perf:`, `docs:`, or `chore:`.