Create pull_request_template.md

Author: gawdn

.github/pull_request_template.md

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+<!-- This is an generated PR template by @gawdn -->
+<!-- Please ensure you complete the checklist -->
+
+## Changes
+- List all major changes made here
+
+## Change reason
+List the reason you are making the change here.
+
+## Comments
+- Add any other comments about the PR here
+
+## Closes
+- Add issues that this PR closes here
+
+## Checklist
+- [ ] PR is named appropriately (describe what it does/changes/fixes)
+- [ ] Changes are "atomic" (related to the same thing) otherwise consider splitting your PR into two changes
+- [ ] You have linked the issues this PR closes by using `Close #issue_number`
+- [ ] You have assigned this PR to yourself (or as appropriate)
+- [ ] You have assigned reviewers to the PR
+- [ ] You have labelled this PR appropriately
+- [ ] You have set the project and milestone
+- [ ] You have rebased this PR against the remote base branch using `git rebase -i origin/dev` (other relevant base branch). Read the [contributing guide](CONTRIBUTING.md) if you're unsure.