docs: add Japanese README

[eltociear]

User description

I created Japanese translated README.

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PR Type

Documentation

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Description

• Added a new README file in Japanese (README-ja_JP.md) with comprehensive documentation including installation, usage, and contribution guidelines.
• Updated existing README files (README.md and README-zh_CN.md) to include a link to the newly added Japanese README.

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Changes walkthrough 📝

Relevant files

Documentation

README-ja_JP.md Add Japanese translation for README documentation                README-ja_JP.md Added a new README file in Japanese. Included installation instructions and usage examples. Provided command help and configuration details. Added sections for support, requirements, and contribution. +206/-0  README-zh_CN.md Update README with Japanese link                                                  README-zh_CN.md Added link to the Japanese README. +1/-1      README.md Update README with Japanese link                                                  README.md Added link to the Japanese README. +1/-1

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⚡ Recommended focus areas for review Translation Accuracy The newly added Japanese README should be reviewed by a native Japanese speaker to ensure the translation is accurate and natural.

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[guanguans]

@eltociear thanks