Add item command

[digitalghost-dev]

The tool's next command, item, will be available in v1.4.0.

Example:

┏━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┓
┃                                ┃
┃  Choice Band                   ┃
┃  Cost: 4000                    ┃
┃  Category: Choice              ┃
┃  ---                           ┃
┃  Description:                  ┃
┃  An item to be held by a       ┃
┃  Pokémon. This curious         ┃
┃  headband boosts Attack but    ┃
┃  only allows the use of        ┃
┃  one move.                     ┃
┃                                ┃
┗━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┛