Add pull request template

.github/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.
+    List any dependencies that are required for this change. -->
+
+Fixes # (issue)
+
+## Type of change
+
+- [ ] Bug fix
+- [ ] New feature
+- [ ] Breaking change
+
+## Checklist:
+
+- [ ] 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
+- [ ] I have checked my code and corrected any misspellings