Add pull request template

.github/pull_request_template.md

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+### Purpose of this PR
+
+[Desc 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 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.]
+
+### Technical risk
+
+[Overall product level assessment of risk of change. Need technical risk & halo effect.]
+
+### Comments 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.]