Prepare binary implementation (#29)

* refactor(main.py): added an entrypoint to run the program

this is necessary in order to create a binary using pyinstaller

* build(poetry): added pyinstaller dependency

the dependency was added in a "build" section. It will help to create project binaries for different platforms (windows, mac os, etc...)

* test(main.py): skipped entrypoint from coverage report

the condition "if __name__ == '__main__'" is not important for coverage