doc: Add client/server model picture

docs/klish-client-server.drawio

@@ -0,0 +1,115 @@
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docs/klish3.ru.md

@@ -47,6 +47,8 @@ Klish в первую очередь рассчитан на подход Cisco,
 
 ## Основные сведения
 
+![Клиент-серверная модель Klish](/klish-client-server.png "Клиент-серверная модель Klish")
+
 Основа проекта klish - библиотека libklish. На ее основе построены клиент klish
 и сервер klishd. Основную работу выполняет сервер klishd. Он загружает
 конфигурацию команд и ожидает запросов от клиентов. Взаимодействие между