Add ja resources

Author: gnbm

i18n/ja/docusaurus-plugin-content-docs/current/README.md

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+# Docs folder
+
+The `/docs` folder houses all markdown files. The page structure loosely maps to the routing on the site since paths can be changed in the frontmatter.
+
+## Versioning
+
+This folder can also contain components, assets, and whatever else is meant to be versioned when the docusaurus versioning script is run. For example, if there is a page component that is only relevant to the `layout` section in the current version of Ionic, it could be added to a `_components/` folder in `docs/layout/`. When the versioning script is run, the component will be copied to `versioned_docs/version-{X}/layout/_components/` and there will now be a separate component in `docs/layout/_components/` that can be deleted or updated to the latest version. The same concept applies to images and other files.
+
+If components are meant to be shared across versions, they can be put in `src/components/`. If images and other served files are meant to be shared across versions they can be put in `static/`.
+
+## Auto Generated Files
+
+All markdown files in these directories are generated from [scripts](/scripts):
+
+- `docs/api/`
+- `docs/cli/commands/`
+- `docs/native/`