Create PULL_REQUEST_TEMPLATE.md

Author: tanthanhdev

.github/PULL_REQUEST_TEMPLATE.md

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+## Description
+<!-- Please describe the changes you have made -->
+
+## Related Issue
+<!-- Please link to the issue here: -->
+Fixes # (issue)
+
+## Type of Change
+<!-- Please select the appropriate options by putting an x in the brackets -->
+- [ ] New content (notes, snippets)
+- [ ] Content improvement (updates, fixes, expansion)
+- [ ] Documentation update
+- [ ] Bug fix (non-breaking change which fixes an issue)
+- [ ] Infrastructure/tooling (CI, scripts, etc.)
+- [ ] Translation (i18n) - specify language: ______
+- [ ] Other (please describe):
+
+## Checklist
+<!-- Please make sure to go through this checklist before submitting your PR -->
+- [ ] My content follows the style guidelines of this project
+- [ ] I have performed a self-review of my own content/code
+- [ ] I have included references/links where appropriate
+- [ ] My changes generate no new warnings or errors
+- [ ] I have checked formatting with markdownlint or similar tools
+- [ ] I have checked that all links are valid
+- [ ] For translations: I've followed the i18n folder structure (i18n/[language_code]/...)
+
+## Additional Notes
+<!-- Any additional information that may be helpful for reviewers -->