Add PR template

.github/PULL_REQUEST_TEMPLATE.md

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+<!-- Before you submit your Pull Request, make sure you picked the right branch:
+
+     - For hotfixes, select "master" as the target branch
+     - For new features and non-hotfix bugfixes, select "develop" as the target branch
+     - For release feature fixes, select the relevant release branch (release/X.Y.Z) as the target branch -->
+
+## Purpose
+<!-- Why is this change necessary? What does it do? -->
+
+
+## Summary of Changes/Side Effects
+<!-- What did you change?
+Include before/after screenshots or a video/gif if applicable.
+Do these changes have any unforseen effects (good or bad)?-->
+
+
+## Testing Notes
+<!-- What needs to be tested?
+Are there any edge cases that should be tested? -->
+
+
+## Ticket
+
+https://openscience.atlassian.net/browse/IN-
+
+## Notes for Reviewer
+<!-- Any area you want the reviewer to pay special attention to or areas of concern?-->
+
+
+# Reviewer Checklist
+
+- [ ] meets requirements
+- [ ] easy to understand
+- [ ] DRY
+- [ ] testable and includes test(s)
+- [ ] changes described in `CHANGELOG.md`
+
+<!-- Please strike through any checks that you think are not relevant for this PR and indicate why, e.g.
+
+     - [ ] ~~easy to understand~~ *(necessarily complex)*
+-->