📝 Add Pull Request template

Author: deraw

PULL_REQUEST_TEMPLATE.md

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+# Description
+
+Please include a summary of the change and which issue is fixed. Please also include relevant motivation and context.
+
+Fixes #(link to issue)
+
+## Type of change
+
+Please delete options that are not relevant.
+
+-   [ ] 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)
+-   [ ] This change requires a documentation update
+
+## 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
+-   [ ] I have made corresponding changes to the documentation
+-   [ ] My changes generate no new warnings