Create PR template based on the one used on Ono

.github/pull_request_template.md

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+## Purpose of this PR
+
+**Ticket/Jira #:**
+
+<!-- Description of feature/change. Links to screenshots, design docs, user docs, etc. Remember reviewers may be outside your team, and not know your feature/area that should be explained more. -->
+
+
+## Testing
+
+**Functional Testing status:**
+
+<!-- Explanation of what's tested, how tested and existing or new automation tests. Can include manual testing by self and/or QA. Specify test plans. Rarely acceptable to have no testing.  -->
+
+**Performance Testing status:**
+
+<!-- Could this PR affect performance? If so, what has been done to measure time taken / memory used etc? Can include new or existing performance tests. Also see [Ensuring Performance by Default](https://confluence.unity3d.com/display/DEV/Ensuring+Performance+by+Default). -->
+
+## Overall Product Risks
+<!-- See Testing Status, Complexity and Halo Effect for your PR](https://confluence.unity3d.com/display/DEV/Testing+Status%2C+Complexity+and+Halo+Effect+for+your+PR). -->
+
+**Complexity:**
+<!-- (Minimal / Low / Medium / High) -->
+
+**Halo Effect:**
+<!-- (Minimal / Low / Medium / High) -->
+
+## Additional information
+
+**Note to reviewers:**
+
+<!-- Info per person for what to focus on, or historical info to understand who have previously reviewed and coverage. Help them get context. -->
+
+**Reminder:**
+<!-- Things to remember to do before finalizing this PR. -->
+- [ ] Add entry in CHANGELOG.md _(if applicable)_