Added Item __str__

[antoninoLorenzo]

I added the __str__ function to item.py because I had some difficulty reading the output of the api requests so I tought it was a good idea adding a better string formatting.

I didn't added new tests because this hasn't nothing to do with functionality so I just tried to print the output and run the main.py script in the test folder. Still if it needs a standalone test I can add one without problems.

[wchistow]

This method (__str__) can be like this:

def __str__(self) -> str:
    out = [f'{k}: {v}' for k, v in self.data.items()]
    return '\n'.join(out)

but your variant is good too.

[antoninoLorenzo]

Didn't tought about doing it that way, however there shouldn't be performance/memory drawbacks.

Still, thank you for your time.