Add "Functional programming" section in russian. (#2651)

 Co-authored-by: Dima Kotobotov <dima@kotobotov.ru>

Author: artemkorsakov

_overviews/scala3-book/collections-classes.md

@@ -2,7 +2,7 @@
 title: Collections Types
 type: section
 description: This page introduces the common Scala 3 collections types and some of their methods.
-languages: [zh-cn]
+languages: [ru, zh-cn]
 num: 37
 previous-page: collections-intro
 next-page: collections-methods

_overviews/scala3-book/collections-intro.md

@@ -2,7 +2,7 @@
 title: Scala Collections
 type: chapter
 description: This page provides and introduction to the common collections classes and their methods in Scala 3.
-languages: [zh-cn]
+languages: [ru, zh-cn]
 num: 36
 previous-page: packaging-imports
 next-page: collections-classes

_overviews/scala3-book/collections-methods.md

@@ -2,7 +2,7 @@
 title: Collections Methods
 type: section
 description: This page demonstrates the common methods on the Scala 3 collections classes.
-languages: [zh-cn]
+languages: [ru, zh-cn]
 num: 38
 previous-page: collections-classes
 next-page: collections-summary

_overviews/scala3-book/collections-summary.md

@@ -2,7 +2,7 @@
 title: Summary
 type: section
 description: This page provides a summary of the Collections chapter.
-languages: [zh-cn]
+languages: [ru, zh-cn]
 num: 39
 previous-page: collections-methods
 next-page: fp-intro

_overviews/scala3-book/fp-functional-error-handling.md

@@ -2,7 +2,7 @@
 title: Functional Error Handling
 type: section
 description: This section provides an introduction to functional error handling in Scala 3.
-languages: [zh-cn]
+languages: [ru, zh-cn]
 num: 45
 previous-page: fp-functions-are-values
 next-page: fp-summary

_overviews/scala3-book/fp-functions-are-values.md

@@ -2,7 +2,7 @@
 title: Functions Are Values
 type: section
 description: This section looks at the use of functions as values in functional programming.
-languages: [zh-cn]
+languages: [ru, zh-cn]
 num: 44
 previous-page: fp-pure-functions
 next-page: fp-functional-error-handling

_overviews/scala3-book/fp-immutable-values.md

@@ -2,7 +2,7 @@
 title: Immutable Values
 type: section
 description: This section looks at the use of immutable values in functional programming.
-languages: [zh-cn]
+languages: [ru, zh-cn]
 num: 42
 previous-page: fp-what-is-fp
 next-page: fp-pure-functions

_overviews/scala3-book/fp-intro.md

@@ -2,7 +2,7 @@
 title: Functional Programming
 type: chapter
 description: This chapter provides an introduction to functional programming in Scala 3.
-languages: [zh-cn]
+languages: [ru, zh-cn]
 num: 40
 previous-page: collections-summary
 next-page: fp-what-is-fp

_overviews/scala3-book/fp-pure-functions.md

@@ -2,7 +2,7 @@
 title: Pure Functions
 type: section
 description: This section looks at the use of pure functions in functional programming.
-languages: [zh-cn]
+languages: [ru, zh-cn]
 num: 43
 previous-page: fp-immutable-values
 next-page: fp-functions-are-values

_overviews/scala3-book/fp-summary.md

@@ -2,7 +2,7 @@
 title: Summary
 type: section
 description: This section summarizes the previous functional programming sections.
-languages: [zh-cn]
+languages: [ru, zh-cn]
 num: 46
 previous-page: fp-functional-error-handling
 next-page: types-introduction

_overviews/scala3-book/fp-what-is-fp.md

@@ -2,7 +2,7 @@
 title: What is Functional Programming?
 type: section
 description: This section provides an answer to the question, what is functional programming?
-languages: [zh-cn]
+languages: [ru, zh-cn]
 num: 41
 previous-page: fp-intro
 next-page: fp-immutable-values

_overviews/scala3-book/packaging-imports.md

@@ -2,7 +2,7 @@
 title: Packaging and Imports
 type: chapter
 description: A discussion of using packages and imports to organize your code, build related modules of code, control scope, and help prevent namespace collisions.
-languages: [zh-cn]
+languages: [ru, zh-cn]
 num: 35
 previous-page: fun-summary
 next-page: collections-intro

_ru/scala3/book/collections-classes.md

@@ -0,0 +1,22 @@
+---
+layout: multipage-overview
+title: Коллекции в Scala
+scala3: true
+partof: scala3-book
+overview-name: "Scala 3 — Book"
+type: chapter
+description: На этой странице представлено введение в общие классы коллекций и их методы в Scala 3.
+language: ru
+num: 36
+previous-page: packaging-imports
+next-page: collections-classes
+---
+
+В этой главе представлены наиболее распространенные коллекции Scala 3 и сопутствующие им методы. 
+Scala поставляется с множеством типов коллекций, 
+Вы можете многого добиться, начав использовать лишь небольшое количество типов, а затем, по мере необходимости, начать применять остальные. 
+Точно так же у каждого типа есть десятки методов, 
+облегчающих разработку, но можно многого добиться, начав лишь с нескольких.
+
+Поэтому в этом разделе представлены наиболее распространенные типы и методы коллекций, 
+которые вам понадобятся для начала работы.