Create PULL_REQUEST_TEMPLATE.md

Author: dbader

.github/PULL_REQUEST_TEMPLATE.md

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+**How to merge your changes:** 
+
+1. Make sure the CI code style tests all pass. 
+2. Find an RP Team member on Slack and ask them to review & approve your PR.
+3. Once the PR has one positive ("approved") review, GitHub lets you merge the PR.
+4. 🎉