add pull request template

.github/pull_request_template.md

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+<!-- 
+Thanks for contributing! 
+Please provide detailed information about your changes to help the reviewers.
+-->
+
+**Type of Change** 
+<!-- Check relevant options with "x" -->
+- [ ] Bug fix (non-breaking change which fixes an issue)
+- [ ] New feature (non-breaking change which adds functionality)
+- [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
+- [ ] Refactoring (internal code improvements, no user-facing changes)
+- [ ] Documentation update 
+- [ ] Other (please describe):
+
+**Related Issue(s)**
+<!-- Link the related GitHub issue(s) here. -->
+<!-- Use "Fixes #issue_number" if this PR closes the issue. -->
+<!-- Use "Related to #issue_number" if it's relevant but doesn't close it. -->
+
+- Fixes #
+- Related to #
+
+**Proposed Changes**
+<!-- Describe your changes clearly and concisely. -->
+<!-- What problem does this PR solve? What changes were made? -->
+
+- 
+- 
+- 
+
+**Testing Steps**
+<!-- Describe how the reviewer can test your changes. -->
+<!-- Provide specific steps. e.g.: -->
+<!-- 1. Open a note with a nested list of checkboxes -->
+<!-- 2. Enable setting 'X' -->
+<!-- 3. Click the parent checkbox -->
+<!-- 4. Verify that child checkboxes now have symbol 'Y' -->
+
+1. 
+2. 
+3. 
+
+**Checklist**
+<!-- Go through all the following points, and put an "x" in all the boxes that apply. -->
+<!-- If you're unsure about any of these, don't hesitate to ask. We're here to help! -->
+- [ ] My code follows the style guidelines of this project (if any).
+- [ ] I have performed a self-review of my own code.
+- [ ] I have commented my code where necessary, particularly in hard-to-understand areas.
+- [ ] I have made corresponding changes to the documentation (in the `/docs` folder).
+- [ ] My changes generate no new warnings.
+- [ ] I have added tests that prove my fix is effective or that my feature works (if applicable).
+- [ ] New and existing unit tests pass locally with my changes (if applicable).
+- [ ] Any dependent changes have been merged and published in downstream modules.
+
+**Additional Information**
+<!-- Add any other context, screenshots, or considerations here. -->
+<!-- For example: performance implications, potential side effects, etc. -->