Create pull_request_template.md (#287)

.github/pull_request_template.md

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+### Description
+
+Please explain the changes you made here.
+
+### Checklist
+
+#### General
+
+- [ ] Added the correct label
+- [ ] Assigned to a specific person or `civiform/deployment-system` 
+- [ ] Created tests which fail without the change (if possible)
+- [ ] Performed manual testing (at a minimum run `bin/setup` without your changes and then `bin/deploy` with your changes to ensure your changes don't break existing deployments)
+- [ ] Extended the README / documentation, if necessary
+
+### Instructions for manual testing
+
+If instructions are needed for manual testing by reviewers, include them here.
+
+### Issue(s) this completes
+
+Fixes #<issue_number>; Fixes #<issue_number>...