chore: add PR template

.github/PULL_REQUEST_TEMPLATE.md

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+## Proposed changes
+
+Describe the big picture of your changes here to communicate to the maintainers why we should accept this pull request.
+
+## Fixes
+
+If it fixes a bug or resolves a feature request, be sure to link to that issue.
+
+## Types of changes
+
+What types of changes does your code introduce? (A **breaking change** is a fix or feature that would cause existing functionality and APIs to not work as expected.)
+_Put an `x` in the box that applies_
+
+- [ ] Non-breaking fix (non-breaking change which fixes an issue)
+- [ ] Breaking fix (breaking change which fixes an issue)
+- [ ] Non-breaking feature (non-breaking change which adds functionality)
+- [ ] Breaking feature (breaking change which adds functionality)
+- [ ] Refactor (non-breaking change which changes implementation)
+- [ ] Messy (mixture of the above - requires explanation!)
+
+## Checklist
+
+_Put an `x` in the boxes that apply._
+
+- [ ] I have read the [CONTRIBUTING](../blob/main/CONTRIBUTING.md) doc
+- [ ] I am making a pull request against the `main` branch (left side). Also you should start your branch off our `main`.
+- [ ] Lint and unit tests pass locally with my changes
+- [ ] I have added tests that prove my fix is effective or that my feature works
+
+## Further comments
+
+If this is a relatively large or complex change, kick off the discussion by explaining why you chose the solution you did and what alternatives you considered, etc...