Create pull_request_template.md

.github/pull_request_template.md

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+# Summary
+Describe high-level WHAT this pull request aims to achieve and WHY the changes are made. 
+
+
+## ⚡️ Code changes
+List code changes here:
+- change A
+- change B
+- ...
+
+
+## ☑️ PR checklist
+
+- [ ] I have linked to the issue nr that this PR aims to resolve.
+- [ ] If this PR is not yet ready to be merged, I have set it to "Draft".
+- [ ] I have added tests for new features or the bug that this PR aims to fix.
+- [ ] I have provided docstrings for new functions.
+- [ ] I updated the repository documentation if these code changes touch the interface.