Add phpcodesniffer-composer-installer to README

Author: sirbrillig

README.md

@@ -14,6 +14,24 @@ Plugin for PHP_CodeSniffer static analysis tool that adds analysis of problemati
 
 VariableAnalysis requires PHP 5.4 or higher and [PHP CodeSniffer](https://github.com/squizlabs/PHP_CodeSniffer) version **3.0.2** or higher.
 
+### With PHPCS Composer Installer
+
+This is the easiest method.
+
+First, install [phpcodesniffer-composer-installer](https://github.com/DealerDirect/phpcodesniffer-composer-installer) for your project if you have not already. This will also install PHPCS.
+
+```
+composer require --dev dealerdirect/phpcodesniffer-composer-installer
+```
+
+Then install these standards.
+
+```
+composer require --dev sirbrillig/phpcs-variable-analysis
+```
+
+It should just work after that!
+
 ### Standalone
 
 1. Install PHP_CodeSniffer by following its [installation instructions](https://github.com/squizlabs/PHP_CodeSniffer#installation) (via Composer, Phar file, PEAR, or Git checkout).