docs: add Japanese translate documents

[eltociear]

I created Japanese translated documents.
translated from Chinese to Japanese.

[krahets]

Hi @eltociear, awesome work!

May I ask what tool you use to translate the book into Japanese, and which language version you use as the source (Chinese version or English version)?

Thank you!

[eltociear]

@krahets

Thank you for your question!
For the Japanese translation, I used DeepL as the main translation tool, and my work was based on the Chinese version of the book as the source text.