Introduced Pull Request template

.github/PULL_REQUEST_TEMPLATE.md

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+## Prerequisites
+
+<!-- Mark completed items with an [x] -->
+
+- [ ] I have followed the [WooCommerce Contributing guideline](https://github.com/woocommerce/woocommerce/blob/master/.github/CONTRIBUTING.md)?
+- [ ] My code follows the [WordPress' coding standards](https://make.wordpress.org/core/handbook/best-practices/coding-standards/).
+- [ ] I have added tests to cover my changes.
+- [ ] All new and existing tests passed.
+
+## Changes proposed in this Pull Request
+
+<!-- Describe the changes made to this Pull Request, and the reason for such changes. -->
+
+Closes # .
+
+
+
+## Steps to reproduce or test
+
+<!-- We need to be able to reproduce or test, so please be descriptive! -->
+
+1.
+2.
+3.
+
+## Type of changes
+
+<!-- What types of changes does your code introduce? -->
+<!-- Mark completed items with an [x] -->
+
+- [ ] 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)
+- [ ] My change requires a change to the documentation.
+
+## Changelog entry
+
+<!-- Enter a short summary of all changes on this Pull Request, this will appear in the changelog if this Pull Request is accepted. -->
+
+-