Create CLI

[g4brielvs]

Even though the original project focused on simple scripts, much of the code logic can be converted to object-oriented and more pythonic.

[slmnsh]

use poetry to do that btw what this code does?

[g4brielvs]

@salmannotkhan the legacy module is where PySynth's code lives. I am working on refactoring it and moving it to core with extended functionality