* rename to variables_php.md
Added basic info about PHP variables.
* Added Guide About PHP Variables (Russian)
* Rename variables_php.md to index.md
* Rename guide/russian/php/PHP Variables to guide/russian/php/php-variables/index
* Delete index
* fix: fixed foldernames
* update index.md
added example from 8th line;
added markdown for highlighting code.
* ch