Create pull_request_template.md

Author: DeveloperTryingToCodeLikeOtherOfThem

.github/pull_request_template.md

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+<!-- Thank you for submitting a Pull Request. Please:
+* Read the Pull Request guidelines:
+  https://github.com/microsoft/vscode/wiki/How-to-Contribute#pull-requests
+* Associate an issue with the Pull Request.
+* Ensure that the code is up-to-date with the `main` branch.
+* Include a description of the proposed changes and how to test them.
+-->