Add korean-date-converter extension

[youngkyo0504]

Description

This PR introduces a new Raycast extension called "Korean Date Converter". This extension allows users to convert Korean date expressions (such as "다음주 화요일", "3일 후") into actual dates.(10/08 or 10/11)

It provides a simple and efficient way for users to interpret relative date expressions in Korean within the Raycast environment.

Screencast

Checklist

• I read the extension guidelines
• I read the documentation about publishing
• I ran npm run build and tested this distribution build in Raycast
• I checked that files in the assets folder are used by the extension itself
• I checked that assets used by the README are placed outside of the metadata folder

[raycastbot]

Congratulations on your new Raycast extension! 🚀

You can expect an initial review within five business days.

Once the PR is approved and merged, the extension will be available on our Store.

[pernielsentikaer]

Could you add this in English instead? You can create a README-ko.md if needed with this.

[youngkyo0504]

Thank you. I worked on it. It does not need README-ko.md.

[pernielsentikaer]

What about a preference to let the user choose between copy/paste?

[youngkyo0504]

What about a preference to let the user choose between copy/paste?

I add commit which implement preference. df544d9

[youngkyo0504]

I add commit which implement preference. df544d9