Rollup merge of #151098 - partrita:main, r=Mark-Simulacrum

Add Korean translation to Rust By Example

Hello,

I’ve added a Korean translation file to Rust By Example.
This contribution will help Korean readers learn Rust more easily by providing localized explanations and examples.

Please review the proposed additions when you have time.

Thanks in advance for your time and review! 🙏

Add Korean translation. Thanks in advance.

Author: matthiaskrgr