Pull request templates (#132)

* add general PR template

Co-authored-by: Simon Swan <[email protected]>

.github/pull_request_template.md

@@ -0,0 +1,14 @@
+## Description
+<!-- Please describe your changes. Use screenshots and permalinks where possible. -->
+
+
+## Pull request checklist
+
+Please check if your PR fulfills the following requirements. ~Cross out~ items if they aren't applicable:
+- [ ] There is not an existing pull request for the same update or change
+- [ ] Tests covering the changes or additions have been added
+- [ ] Docs have been updated or modified to reflect the changes or additions
+- [ ] The pull request follows the guidelines in our Contributing document
+
+## Related issues:
+- #<!-- Issue reference number. -->