Readme updates

Author: mandraszyk

README.md

@@ -1,10 +1,6 @@
-Voucherify-SDK-PHP usage sample
+# Voucherify-SDK-PHP usage sample
 
-Install composer - php dependencies management tool
-https://getcomposer.org/
+> Install [Composer](https://getcomposer.org/) - PHP dependencies management tool which by default use [Packagist](https://packagist.org/) as main packages repository - Voucherify is already there.
 
-Composer use Packagist as main repository.
-https://packagist.org/
-
-Run from Command Line: composer install - to download dependencies (voucherify-php-sdk)
-Run from Command Line: php sample.php - to execute sample project
+Run from system command line: `composer install` - to download dependencies (voucherify-php-sdk)
+Run from system command line: `php sample.php` - to execute sample project