docs: add pull request template (#224)

.github/pull_request_template.md

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+<!--- Provide a general summary of your changes in the Title above -->
+
+## Description
+
+<!-- A short (or detailed) description of what this PR does and why these changes are needed -->
+
+## How to Test
+
+<!--- Please describe in detail how you tested your changes -->
+
+## Checklist
+
+- [ ] I have performed a self-review of my code.
+- [ ] I have added tests for my changes.
+- [ ] I have run linter locally (`npm run lint`) and all checks pass.
+- [ ] I have run tests locally (`npm test`) and all tests pass.
+- [ ] I have commented on my code, particularly in hard-to-understand areas.
+<!-- - [ ] Any other relevant item -->
+
+## Screenshots (if appropriate):
+
+## Related PR(s)/Issue(s)
+
+<!-- - <https://github.com/grafana/k6-studio/issues/...> -->
+
+<!-- Does it resolve an issue? -->
+
+<!-- Resolves #ISSUE-ID -->
+
+<!-- Thanks for your contribution! 🙏🏼 -->