Update README.md

Author: snapshotpl

Diff for: README.md

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 # log-http-messages middleware [![Build Status](https://travis-ci.org/php-middleware/log-http-messages.svg)](https://travis-ci.org/php-middleware/log-http-messages)
 Request and response middleware logger with PSR-7 and PSR-3
+
+This middleware provide framework-agnostic possibility to log request and response messages to PSR-3 logger.
+
+## Installation
+
+```json
+{
+    "require": {
+        "php-middleware/log-http-messages": "^1.0.0"
+    }
+}
+```
+
+To log any request you need pass into `LogRequestMiddleware` instance `Psr\Log\LoggerInterface` and add middleware to your middleware runner. To log response use `LogResponseMiddleware`.
+
+```php
+$logRequestMiddleware = new PhpMiddleware\LogHttpMessages\LogRequestMiddleware($logger);
+$logResponseMiddleware = new PhpMiddleware\LogHttpMessages\LogResponseMiddleware($logger);
+
+$app = new MiddlewareRunner();
+$app->add($logRequestMiddleware);
+$app->add($logResponseMiddleware);
+$app->run($request, $response);
+```
+
+Middlewares have optional second parameter in constructor with log level (default `Psr\Log\LogLevel::INFO`).
+
+## It's just works with any modern php framework and logger!
+
+Middleware tested on:
+* [Expressive](https://github.com/zendframework/zend-expressive)
+* [monolog](https://github.com/Seldaek/monolog)
+
+Middleware should works with:
+* [Slim 3.x](https://github.com/slimphp/Slim)
+* [zend-log 2.6](https://github.com/zendframework/zend-log)
+
+And any other modern framework [supported middlewares and PSR-7](https://mwop.net/blog/2015-01-08-on-http-middleware-and-psr-7.html) and [PSR-3 implementation](http://www.php-fig.org/psr/psr-3/) logger.