Add nanum square font family casks

[wodory]

Important: Do not tick a checkbox if you haven’t performed its action. Honesty is indispensable for a smooth review process.

In the following questions <cask> is the token of the cask you're submitting.

After making any changes to a cask, existing or new, verify:

• The submission is for a stable version or documented exception.
• brew audit --cask --online <cask> is error-free.
• brew style --fix <cask> reports no offenses.

Additionally, if adding a new cask:

• Named the cask according to the token reference.
• Checked the cask was not already refused (add your cask's name to the end of the search field).
• brew audit --cask --new <cask> worked successfully.
• HOMEBREW_NO_INSTALL_FROM_API=1 brew install --cask <cask> worked successfully.
• brew uninstall --cask <cask> worked successfully.

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[khipp]

The installation seems to only fail on the Intel-based runner. Maybe it has something to do with the archive?

[bevanjkay]

@wodory I pushed an update to use the otf variants, as we usually prefer these over ttf, unless there is a compelling reason to stay with the ttf options?

[wodory]

@wodory I pushed an update to use the otf variants, as we usually prefer these over ttf, unless there is a compelling reason to stay with the ttf options?

OTF fonts, especially in MS Office, may cause some minor problems with the spacing of Korean characters. That's why I chose TTF.

[khipp]

Thank you for your first contribution to homebrew-cask, @wodory! 🎉