docs: 開発環境のセットアップ手順を詳細にする

CONTRIBUTING.md

@@ -106,6 +106,11 @@ If your language is not listed in Crowdin, please open an issue.
 ![Crowdin](https://d322cqt584bo4o.cloudfront.net/misskey/localized.svg)
 
 ## Development
+Before developing, you could set up Devcontainer with VSCode. Devcontainer has necessary setting for development server such as Redis and PostgreSQL.
+
+> [!NOTE]
+> Support from JetBrain's IDE may be limited. In doubtful situation, we recommend using VSCode.
+
 During development, it is useful to use the
 
 ```