docs: add Japanese README (#857)

Wendong-Fan · web-flow · commit b2bd69150769 · 2026-01-15T23:36:38.000Z
diff --git a/README.md b/README.md
@@ -23,7 +23,7 @@
 <hr/>
 <div align="center">
 
-**English** · [简体中文](./README_CN.md) · [Official Site][eigent-site] · [Documents][docs-site] · [Feedback][github-issue-link]
+**English** · [简体中文](./README_CN.md) · [日本語](./README_JA.md) · [Official Site][eigent-site] · [Documents][docs-site] · [Feedback][github-issue-link]
 
 </div>
 <br/>
diff --git a/README_CN.md b/README_CN.md
@@ -23,7 +23,7 @@
 <hr/>
 <div align="center">
 
-[English](./README.md) · **简体中文** · [官方网站][eigent-site] · [文档][docs-site] · [反馈][github-issue-link]
+[English](./README.md) · **简体中文** · [日本語](./README_JA.md) · [官方网站][eigent-site] · [文档][docs-site] · [反馈][github-issue-link]
 
 </div>
 <br/>
diff --git a/README_JA.md b/README_JA.md
