ENH: add pr message

See merge request iMSTK/iMSTK!584

.gitlab/merge_request_templates/feature.md

+<!-- The text within this markup is a comment, and is intended to provide
+guidelines to open a Pull Request for the iMSTK repository. This text will not
+be part of the Pull Request. -->
+
+<!-- See the [Contributing guidelines](https://gitlab.kitware.com/iMSTK/iMSTK/-/blob/master/CONTRIBUTING.md). Specifically:
+
+Start commit messages with a standard prefix (and a space):
+
+ * BUG: fix for runtime crash or incorrect result
+ * COMP: compiler error or warning fix
+ * DOC: documentation change
+ * ENH: new functionality
+ * PERF: performance improvement
+ * STYLE: no logic impact (indentation, comments)
+ * WIP: Work In Progress not ready for merge
+ * REFAC: Refactoring the code
+
+Provide a short, meaningful message that describes the change you made.
+
+When the PR is based on a single commit, the commit message is usually left as
+the PR message.
+-->
+
+## PR Checklist
+- [ ] No API changes were made (or the changes have been approved)
+- [ ] No major design changes were made (or the changes have been approved)
+- [ ] No new dependecies were added (or the new dependencies have been approved)
+- [ ] Added test (or behavior not changed)
+- [ ] Updated API documentation (or API not changed)
+- [ ] Ran the `CodeFormatEnforcer` task and verified the header is in all new files 
+- [ ] Added [iMSTK examples](https://gitlab.kitware.com/iMSTK/iMSTK/-/tree/master/Examples) for all new major features (if any)
+
+<!-- **Thanks for contributing to iMSTK!** -->
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