Translation information in README.md (vuejs#698)

* Translation information in README.md

I'm dreaming of making Translation Gang an international community of open-source translators, so there's a little bit of advertisement here, not just the information on existing translation projects.

* Revert URL from VueJS.org back to vuejs.org

* Update README.md

* Update README.md

Author: gbezyuk

README.md

@@ -11,3 +11,38 @@ $ npm install -g hexo-cli
 $ npm install
 $ hexo server
 ```
+
+## On Translations
+
+Translation for this documentation project are currently mantained in separate repositories forked from this original one.
+
+### Mandarin
+
+* Translation Repo - [/vuejs/cn.vuejs.org](https://github.com/vuejs/cn.vuejs.org)
+
+### Japanese
+
+* Translation Repo - [/vuejs/jp.vuejs.org](https://github.com/vuejs/jp.vuejs.org)
+
+### Russian
+
+Russian translation is maintained by Translation Gang.
+
+* Translation Repo — [/translation-gang/ru.vuejs.org](https://github.com/translation-gang/ru.vuejs.org)
+* Primary maintainer - [Grigoriy Beziuk](https://gbezyuk.github.io)
+
+### Italian
+
+* Translation Repo - [/vuejs/it.vuejs.org](https://github.com/vuejs/it.vuejs.org)
+
+### Korean
+
+TODO: provide information here
+
+### Want to help with the translation?
+
+If you feel okay with translating sorta alone, just fork the repo, create a "work-in-progress" issue to inform others that you're doing the translation, and just go on.
+
+If you are more of a team player, maybe Translation Gang is for you? Then just let us know somehow that you're ready to join this international open-source translators community. Feel free to contact [Grigoriy Beziuk](https://gbezyuk.github.io) or anybody else from [the team](https://github.com/orgs/translation-gang/people).
+
+And thank you in advance ;)