Create pull_request_template.md

.github/PULL_REQUEST_TEMPLATE/pull_request_template.md

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+## Type of changes
+
+<!-- Put an `x` in the boxes that apply. Try to limit your pull request to one type, submit multiple pull requests if needed. --> 
+
+Please check the type of change your PR introduces:
+- [ ] Bugfix
+- [ ] Feature
+- [ ] Code style update (formatting, renaming)
+- [ ] Refactoring (no functional changes, no api changes)
+- [ ] Build related changes
+- [ ] Documentation content changes
+- [ ] Other (please describe): 
+
+## What is the current behavior?
+<!-- Please describe the current behavior that you are modifying, or link to a relevant issue. -->
+
+- close [issue number]
+
+Related issues : 
+
+
+## What is the new behavior?
+<!-- Please describe the behavior or changes that are being added by this PR. -->
+
+-
+-
+-
+
+## Checklist
+
+<!-- Put an `x` in the boxes that apply. You can also fill these out after creating the PR. If you're unsure about any of them, don't hesitate to ask. We're here to help! This is simply a reminder of what we are going to look for before merging your code. -->
+
+- [ ] Unit tests pass locally with my changes
+- [ ] I have added tests that prove my fix is effective or that my feature works
+- [ ] I have added necessary documentation (if appropriate)
+- [ ] Any dependent changes have been merged and published in downstream modules
+- [ ] I have filled the `[Unreleased]` [Changelog](https://github.com/nodefluxio/vortex/blob/master/README.md)