PR template

.github/PULL_REQUEST_TEMPLATE.md

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+<!--
+Hello 👋 Thank you for submitting a pull request.
+
+To help us merge your PR, make sure to follow the instructions below:
+- Create or update the documentation.
+- Create or update the tests.
+- Refer to the issue you are closing in the PR description - fix #issue
+- Specify if the PR is in WIP (work in progress) state or ready to be merged
+-->
+
+#### Description of what you did: