Create pull request template for contributions

Author: Alexandrbig1

.github/PULL_REQUEST_TEMPLATE.md

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+# Pull Request
+
+Thank you for your contribution!
+
+## Description
+
+Please describe your changes and link any related issues.
+
+## Checklist
+
+- [ ] My code follows the style guidelines of this project
+- [ ] I have performed a self-review of my code
+- [ ] I have commented my code, particularly in hard-to-understand areas
+- [ ] I have made corresponding changes to the documentation
+- [ ] My changes generate no new warnings
+- [ ] I have added tests that prove my fix is effective or that my feature works
+- [ ] New and existing unit tests pass locally with my changes