Add a markdown template for Pull Requests

.github/PULL_REQUEST_TEMPLATE.md

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+# Name of PR
+
+### Your checklist for this pull request
+Thank you for submitting a pull request! To speed up the review process, please follow this checklist:
+
+- [ ] Pull Request is small and focused on one topic so it can be reviewed easily 
+- [ ] Commit messages are detailed
+- [ ] Code compiles correctly
+- [ ] Documentation is updated to reflect changes (docstrings, comments, `/docs`)
+- [ ] Added new tests to cover changes, especially when resolving an issue
+- [ ] All tests pass in offline mode (the default)
+- [ ] All tests pass when run with the `external_api` test option (if possible)
+
+If you're adding a feature that makes network calls, remember to add new tests and 
+follow the test guideline documentation about offline and online testing. 
+
+### Description
+Please describe your pull request.
+
+What does this implement/fix? Explain.
+
+Does this resolve any currently open issues? 
+If so, mention the issues, e.g. `Closes #xxx`, and Github will close them automatically
+when your PR is merged into `main`.
+
+Any relevant logs, error output, etc?
+
+Any other comments? For example, will other contributors need to install new libraries
+after picking up these changes?
+
+💔Thank you!