Add message about contributing to translation

README-ru.md

@@ -10,6 +10,25 @@ l10n:p -->
 
 # Пособие по проектированию систем
 
+<!-- l10n:ignore start -->
+> WARNING: the document is currently being translated
+> If you want to contribute:
+>
+> * choose a task for a section which you want to translate in the [Project](https://github.com/voitau/system-design-primer/projects/4)
+> * assign it to yourself and move it to `In progress`
+> * do not change original text in comments
+> * make PR to this fork. When translation is complete, all changes will go into one PR to main repository.
+>
+> ВНИМАНИЕ: статья находится в процессе активного перевода.
+> Если вы хотите поучастововать:
+>
+> * выберите доступную задачу с секцией для перевода в [Проекте](https://github.com/voitau/system-design-primer/projects/4)
+> * переведите ее состояние в `In progress`
+> * не изменяйте оригинальный текст, находящийся в комментариях
+> * сделайте PR в этот fork. Когда перевод будет готов, все изменения вместе будут предложены в основной репозиторий.
+>
+<!-- l10n:ignore end -->
+
 <p align="center">
   <img src="http://i.imgur.com/jj3A5N8.png"/>
   <br/>
@@ -168,7 +187,7 @@ Content that needs some polishing is placed [under development](#under-developme
 Review the [Contributing Guidelines](CONTRIBUTING.md).
 l10n:p -->
 
-## Содействие
+## Contributing
 
 > Учитесь у сообщества.
 

README.md

@@ -1,4 +1,4 @@
-*[English](README.md) ∙ [日本語](README-ja.md) ∙ [简体中文](README-zh-Hans.md) ∙ [繁體中文](README-zh-TW.md) ∙ [Русский](README-ru.md) | [العَرَبِيَّة‎](https://github.com/donnemartin/system-design-primer/issues/170) ∙ [বাংলা](https://github.com/donnemartin/system-design-primer/issues/220) ∙ [Português do Brasil](https://github.com/donnemartin/system-design-primer/issues/40) ∙ [Deutsch](https://github.com/donnemartin/system-design-primer/issues/186) ∙ [ελληνικά](https://github.com/donnemartin/system-design-primer/issues/130) ∙ [עברית](https://github.com/donnemartin/system-design-primer/issues/272) ∙ [Italiano](https://github.com/donnemartin/system-design-primer/issues/104) ∙ [韓國語](https://github.com/donnemartin/system-design-primer/issues/102) ∙ [فارسی](https://github.com/donnemartin/system-design-primer/issues/110) ∙ [Polski](https://github.com/donnemartin/system-design-primer/issues/68) ∙ [Español](https://github.com/donnemartin/system-design-primer/issues/136) ∙ [ภาษาไทย](https://github.com/donnemartin/system-design-primer/issues/187) ∙ [Türkçe](https://github.com/donnemartin/system-design-primer/issues/39) ∙ [tiếng Việt](https://github.com/donnemartin/system-design-primer/issues/127) ∙ [Français](https://github.com/donnemartin/system-design-primer/issues/250) | [Add Translation](https://github.com/donnemartin/system-design-primer/issues/28)*
+*[English](README.md) ∙ [日本語](README-ja.md) ∙ [简体中文](README-zh-Hans.md) ∙ [繁體中文](README-zh-TW.md) ∙ [Русский](README-ru.md) | [العَرَبِيَّة‎](https://github.com/donnemartin/system-design-primer/issues/170) ∙ [বাংলা](https://github.com/donnemartin/system-design-primer/issues/220) ∙ [Português do Brasil](https://github.com/donnemartin/system-design-primer/issues/40) ∙ [Deutsch](https://github.com/donnemartin/system-design-primer/issues/186) ∙ [ελληνικά](https://github.com/donnemartin/system-design-primer/issues/130) ∙ [עברית](https://github.com/donnemartin/system-design-primer/issues/272) ∙ [Italiano](https://github.com/donnemartin/system-design-primer/issues/104) ∙ [韓國語](https://github.com/donnemartin/system-design-primer/issues/102) ∙ [فارسی](https://github.com/donnemartin/system-design-primer/issues/110) ∙ [Polski](https://github.com/donnemartin/system-design-primer/issues/68) ∙ [Español](https://github.com/donnemartin/system-design-primer/issues/136) ∙ [ภาษาไทย](https://github.com/donnemartin/system-design-primer/issues/187) ∙ [Türkçe](https://github.com/donnemartin/system-design-primer/issues/39) ∙ [tiếng Việt](https://github.com/donnemartin/system-design-primer/issues/127) ∙ [Français](https://github.com/donnemartin/system-design-primer/issues/250) | [Add Translation](https://github.com/donnemartin/system-design-primer/issues/28)* <!-- l10n:select -->
 
 # The System Design Primer