Create pull_request_template.md (#218)

.github/pull_request_template.md

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+<!-- Please refer to our contributing docs for any questions on submitting a pull request -->
+<!-- Issues are required for both bug fixes and features. -->
+Resolves #ISSUE_NUMBER
+
+----
+
+### Before the change?
+<!-- Please describe the current behaviour that you are modifying. -->
+
+* 
+
+### After the change?
+<!-- Please describe the behaviour or changes that are being added by this PR. -->
+
+* 
+
+### Pull request checklist
+- [ ] Tests for the changes have been added (for bug fixes/features)
+- [ ] Docs have been reviewed and added/updated if needed (for bug fixes/features)
+
+### Does this introduce a breaking change?
+<!-- If this introduces a breaking change, make sure to note it here and what the impact might be -->
+
+- [ ] Yes
+- [ ] No
+
+----