Add README

README.md

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+# Yii2 extension for PHPStan
+
+## What does it do?
+
+* Provides correct return type for `Yii::$container->get('service_id')` method,
+* Ignore common problems with active record and request/response objects.
+
+## Installation
+
+```sh
+composer require --dev proget-hq/phpstan-yii2
+```
+
+## Configuration
+
+Put this into your `phpstan.neon` config:
+
+```neon
+includes:
+	- vendor/proget-hq/phpstan-yii2/extension.neon
+parameters:
+    yii2:
+        config_path: %rootDir%/../../../config/test.php
+```
+
+## Limitations
+
+Container closures must have return types.
+
+You have to provide a path to `config/test.php` or other yii2 config file.