add materials about swift (#4106)

* add materials about swift

* fix spaces

* add new material

* fix build

* fix build

* fix build

* fix

free-programming-books-ru.md

@@ -64,6 +64,7 @@
 * [Smalltalk](#smalltalk)
 * [SQL](#sql)
   * [PostgreSQL](#postgresql)
+* [Swift](#swift)
 * [TypeScript](#typescript)
 * [Unix](#unix)
 * [Vim](#vim)
@@ -518,6 +519,12 @@
 * [Работа с PostgreSQL - настройка и масштабирование](http://postgresql.leopard.in.ua) - А. Ю. Васильев
 
 
+### Swift
+
+* [Documentation](https://swift.org/documentation)
+* [Документация и туториалы](https://swiftbook.ru)
+
+
 ### TypeScript
 
 * [Перевод официальной документации Typescript](http://typescript-lang.ru/docs/index.html)

problem-sets-competitive-programming.md

@@ -57,7 +57,7 @@
 ### Information security
 
 * [ångstromCTF](https://angstromctf.com)
-* [CTFtime](https://ctftime.org) 
+* [CTFtime](https://ctftime.org)
 
 
 ### Problem Sets