Create PULL_REQUEST_TEMPLATE.md

.github/PULL_REQUEST_TEMPLATE.md

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+<!--- Provide a general summary of your changes in the Title above -->
+
+## Description
+
+<!--- Describe your changes  -->
+<!--- Why is this change required? What problem does it solve? -->
+<!--- If it fixes an open issue, please link to the issue here. -->
+
+## Screenshots (if appropriate):
+
+## Types of changes
+
+<!--- Leave the one fitting to your PR  -->
+
+- Bug fix (non-breaking change which fixes an issue)
+- New feature (non-breaking change which adds functionality)
+- Breaking change (fix or feature that would cause existing functionality to change)
+
+## Checklist:
+
+<!--- Go over all the following points and make sure you have done all of those -->
+<!--- If you're unsure about any of these, don't hesitate to ask. We're here to help! -->
+
+- My code follows the code style of this project.
+- If my change requires a change to the documentation I have updated the documentation accordingly.
+- I have read the **CONTRIBUTING** document.