docs: add pull request template

.github/pull_request_template.md

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+### Description:
+[Provide a brief description of the changes in the pull request.]
+
+### Related Issue(s):
+[Link to the related Issue(s), if any.]
+
+### Changes Included:
+- [ ] Bugfix (a change that fixes an issue)
+- [ ] New feature (a change that adds new functionality)
+- [ ] Refactoring (a change that improves code quality and/or architecture)
+- [ ] Other (explain below)
+
+### Implementation Details:
+[Explain any new decisions made during the implementation of the changes.]
+
+### Testing:
+[Describe how the changes have been tested.]
+
+### Checklist:
+- [ ] My code follows the style guidelines of this project
+- [ ] I have performed a self-review of my own code
+- [ ] I have commented my code, particularly in hard-to-understand areas
+- [ ] My changes generate no new warnings
+- [ ] Any dependent changes have been merged and published in downstream modules