Add Japanese translated README (#19945)

* Add japanese translated README.md

* Add README_ja.md link

* Add japanese transkate to check_copies.py

* Add guide to Japanese README.md

* Update README_ja.md

Co-authored-by: Younes Belkada <49240599+younesbelkada@users.noreply.github.com>

* Update utils/check_copies.py

Co-authored-by: Sylvain Gugger <35901082+sgugger@users.noreply.github.com>

Co-authored-by: Younes Belkada <49240599+younesbelkada@users.noreply.github.com>
Co-authored-by: Sylvain Gugger <35901082+sgugger@users.noreply.github.com>

utils/check_copies.py

@@ -78,6 +78,14 @@ LOCALIZED_READMES = {
             " {paper_authors}.{supplements}"
         ),
     },
+    "README_ja.md": {
+        "start_prompt": "🤗Transformersは現在、以下のアーキテクチャを提供しています",
+        "end_prompt": "1. 新しいモデルを投稿したいですか？",
+        "format_model_list": (
+            "**[{title}]({model_link})** (from {paper_affiliations}) released with the paper {paper_title_link} by"
+            " {paper_authors}.{supplements}"
+        ),
+    },
 }