Please add usage examples for all supported languages

[yurivict]

I tried this usage example for the Korean language:

from misaki import ko

g2p = ko.G2p()

text = '즐거운 오후 보내시고 나중에 다시 뵙겠습니다.'

phonemes, tokens = g2p(text)

print(phonemes)

but it fails:

$ python3.11 files/usage-ko.py 
Traceback (most recent call last):
  File "/usr/ports/misc/py-misaki/files/usage-ko.py", line 10, in <module>
    g2p = ko.G2p()
          ^^^^^^^^
  File "/usr/local/lib/python3.11/site-packages/misaki/g2pkc/g2pk.py", line 26, in __init__
    self.mecab = self.get_mecab()
                 ^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.11/site-packages/misaki/g2pkc/g2pk.py", line 39, in get_mecab
    import mecab
ModuleNotFoundError: No module named 'mecab'

The mecab dependency is not declared for the ko language so why is it needed?