Add basic test configuration. #59
                
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About this change - What it does
Add tests directory and a test to check if the server runs. Integrate tests in CI.
Resolves:
Contributes to: #2
Why this way
Pytest library seems easy to use and it is very common in python projects.
Implemented a simple test for the sake of the first setup.
Waiting on another PR to integrate git hooks using pre-commit framework.