Add request for examples in PRs adding new shapes or datasets (#219)

.github/pull_request_template.md

@@ -12,3 +12,4 @@ Fixes #
 - [ ] Test cases have been modified/added to cover any code changes.
 - [ ] Docstrings have been modified/created for any code changes.
 - [ ] All linting and formatting checks pass (see the [contributing guidelines](https://github.com/stefmolin/data-morph/blob/main/CONTRIBUTING.md) for more information).
+- [ ] If you added a new dataset or shape, please comment on which datasets worked best for your shape or which shapes worked best for your dataset and provide the GIFs for those here.