add CODEOWNERS and README

Author: Aisha Blake

CODEOWNERS

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+*   @hirotaka @Naturalclar

README.md

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-# Gatsby Internationalization Source
 
-This is a template repo copied over from [gatsbyjs/gatsby](https://github.com/gatsbyjs/gatsby) containing all content that needs to be translated. It is used as a basis for translations. **Do not commit directly to this repo**.
+# Gatsby Japanese Translation
+
+This repo contains the Japanese translation for Gatsby.
+
+Please refer to the [Translation Progress Issue](https://github.com/gatsbyjs/gatsby-ja/issues/1) to start translating!
+
+Useful Links:
+
+* [Style Guide](/style-guide.md)
+* [Gatsby Translation Guide](https://www.gatsbyjs.org/contributing/gatsby-docs-translation-guide/)
+* [Gatsby Discord](https://gatsby.dev/discord)
+
+(Feel free to translate this document and add any content you feel would be useful to contributors).
+