Add scala 3 book in russian

Author: artemkorsakov

_overviews/scala3-book/introduction.md

@@ -5,6 +5,7 @@ description: This page begins the overview documentation of the Scala 3 language
 num: 1
 previous-page: 
 next-page: scala-features
+languages: [ru]
 ---
 
 Welcome to the Scala 3 Book.

_ru/overviews/scala3-book/introduction.md

@@ -0,0 +1,34 @@
+---
+title: Введение
+type: chapter
+description: На этой странице начинается обзорная документация по языку Scala 3.
+num: 1
+previous-page: 
+next-page: scala-features
+---
+
+Добро пожаловать в книгу Scala 3. 
+Цель этой книги — предоставить неформальное введение в язык Scala. 
+Она относительно легко затрагивает все темы Scala. 
+Если в какой-то момент во время чтения этой книги вы захотите получить дополнительную информацию о конкретной функции, 
+вы найдете ссылки на нашу [Справочную документацию][reference], 
+в которой более подробно рассматриваются многие новые функции языка Scala.
+
+<blockquote class="help-info">
+<i class="fa fa-info"></i>&nbsp;&nbsp;If you are interested in the archived Scala 2 edition of the book, you
+can <a href="/overviews/scala-book/introduction.html">access it here</a>. We are currently in the process of
+merging the two books and you can <a href="{% link scala3/contribute-to-docs.md %}">help us</a>.
+</blockquote>
+
+Over the course of this book, we hope to demonstrate that Scala is a beautiful, expressive programming language, with a clean, modern syntax, which supports functional programming (FP) and object-oriented programming (OOP), and that provides a safe static type system.
+Scala’s syntax, grammar, and features have been re-thought, debated in an open process, and updated in 2020 to be clearer and easier to understand than ever before.
+
+The book begins with a whirlwind tour of many of Scala’s features in the [“A Taste of Scala” section][taste].
+After that tour, the sections that follow it provide more details on those language features.
+
+{% comment %}
+We should have a link structure on the whole tour here
+{% endcomment %}
+
+[reference]: {{ site.scala3ref }}/overview.html
+[taste]: {% link _overviews/scala3-book/taste-intro.md %}