Add README.md

Author: UlianaPythonBackendDeveloper

.github/workflows/README.md

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+# Automatic tests
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+After completing all the steps in the project, automatic tests will become available to you. Tests are run on each commit - once all tasks in the Hexlet interface are completed, make a commit, and the tests will run automatically.
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+The hexlet-check.yml file is responsible for running these tests - do not delete this file, edit it, or rename the repository.