Updated README

Author: ondrejmirtes

README.md

@@ -2,3 +2,24 @@
 
 * [PHPStan](https://github.com/phpstan/phpstan)
 * [Nette Framework](https://nette.org/)
+
+This extension provides following features:
+
+* Dynamic methods of [Nette\Utils\Html](https://doc.nette.org/en/2.4/html-elements)
+* Magic [Nette\Object and Nette\SmartObject](https://doc.nette.org/en/2.4/php-language-enhancements) properties
+* Event listeners through the `on*` properties
+
+## Usage
+
+To use this extension, require it in [Composer](https://getcomposer.org/):
+
+```
+composer require phpstan/phpstan-nette
+```
+
+And include extension.neon in your project's PHPStan config:
+
+```
+includes:
+	- vendor/phpstan/phpstan-nette/extension.neon
+```