Update CONTRIBUTING.md and README.md

Author: nakamura-to

CONTRIBUTING.md

@@ -43,6 +43,11 @@ $ sphinx-autobuild . _build/html
 
 Visit the webpage served at http://127.0.0.1:8000.
 
+Your environment is now set up.
+Please verify that the modifications to the RST file are correctly converted into an HTML file, and then submit a pull request.
+
+## Tasks to Be Performed by the Localization Manager
+
 #### Generate POT files
 
 Execute the `sphinx-build` command in the docs directory:

README.md

@@ -11,4 +11,18 @@ We welcome contributions to improve both the English and Japanese versions.
 ## Deployment site
 
 - English: https://doma.readthedocs.io/en
-- Japanese: https://doma.readthedocs.io/ja
+- Japanese: https://doma.readthedocs.io/ja
+
+## To Those Who Can Help Improve English Documentation
+
+Please read the [CONTRIBUTING.md](CONTRIBUTING.md) file.
+
+## To Those Who Can Help with Japanese Translation
+
+日本語翻訳に協力してくれる方は、[Crowdin](https://crowdin.com/project/doma-docs) に登録して翻訳をお願いします。
+英語から日本語への翻訳はもちろん、既存の日本語訳の修正や改善も歓迎します。
+
+Crowdinの使い方や翻訳方針に関する質問は [Issues](https://github.com/domaframework/doma-docs/issues) または [Discussions](https://github.com/domaframework/doma-docs/discussions) でお気軽にどうぞ。
+
+日本語翻訳に関すると問い合わせは日本語で登録いただいて構いません。
+