Create CONTRIBUTING.md

Author: plutov

CONTRIBUTING.md

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+First off all, thank you for considering contributing to this project. It's people like you that make it such a great tool.
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+Keep an open mind! Improving documentation, bug triaging, or writing tutorials are all examples of helpful contributions that mean less work for you.
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+Some basic suggestions to get you started:
+- Make sure the PR is up-to-date with the latest changes in the main branch.
+- Make sure the PR passes all the tests.
+- Make sure the PR passes the linter.
+- Make sure the PR is well documented and formatted.
+- Make sure the PR is well tested.