Created pull_request_template.md

Adding test pull request

.github/pull_request_template.md

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+If this pull request addresses an open issue on the repository, please add 'Closes #NN' below, where NN is the issue number.
+
+Please briefly summarise the changes made in the pull request, and the reason(s) for making these changes.
+
+If any relevant discussions have taken place elsewhere, please provide links to these.
+
+For review requests pertaining to specific episodes, please tag `xortizross` for lesson 4 (minimal reproducible data), `peterlaurin` for 
+lesson 3 (identify the problem) and `kaijagahm` for lesson 1 and 6. For other lessons, feel free to tag whomever.