Create PULL_REQUEST_TEMPLATE.md

Author: twittemb

PULL_REQUEST_TEMPLATE.md

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+## Description
+<!--- Describe your changes in detail, link the related issues -->
+
+## Checklist
+<!--- Go over all the following points, and put an `x` in all the boxes that apply. -->
+- [ ] this PR is based on develop or a 'develop related' branch
+- [ ] the commits inside this PR have explicit commit messages
+- [ ] the Jazzy documentation has been generated (if needed -> Jazzy RxFlow)