Update documentation

Author: noglitchyo

README.md

@@ -1,6 +1,6 @@
 # middleware-collection-request-handler
 
-A simple PSR-15 server request handler implementation to handle middleware collection.
+Lightweight & simple PSR-15 server request handler implementation to handle middleware collection.
 
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 [![Build Status](https://travis-ci.org/noglitchyo/middleware-collection-request-handler.svg?branch=master)](https://travis-ci.org/noglitchyo/middleware-collection-request-handler)
@@ -13,19 +13,44 @@ A simple PSR-15 server request handler implementation to handle middleware colle
 Request handler implementing the [RequestHandlerInterface](https://github.com/php-fig/http-server-handler/blob/master/src/RequestHandlerInterface.php) 
 and able to manage a collection of middlewares implementing the [MiddlewareInterface](https://github.com/php-fig/http-server-middleware/blob/master/src/MiddlewareInterface.php).
 
-This middleware attempts to provide interoperability to process a collection middlewares and
-offer the possibility to define the strategy on how middlewares are fetched.
+This middleware attempts to provide interoperability to process a collection of middlewares and
+give the possibility to define the strategy on how middlewares are fetched.
 
 ### Getting started
 
 #### Installation
 
 `composer require noglitchyo/middleware-collection-request-handler`
 
+#### Run
+
+The RequestHandler class only need 2 arguments:
+
+- A default request handler (implementing [RequestHandlerInterface](https://github.com/php-fig/http-server-handler/blob/master/src/RequestHandlerInterface.php))
+
+It is there to provide the response if no middleware created one.
+For example, you are using ADR pattern, the default request handler might be your Action.
+It is also possible to directly provide a `callable` using `RequestHandler::fromCallable()`. 
+It will generate a generic instance of RequestHandlerInterface wrapping the `callable` inside.
+
+***Remember: the default request handler is responsible for providing a default response.***
+
+- A middleware collection (implementing [MiddlewareCollectionInterface](https://github.com/noglitchyo/middleware-collection-request-handler/blob/master/src/MiddlewareCollectionInterface.php))
+
+It defines how you store your middlewares and the strategy to retrieve them.
+Some implementations are provided by default and will probably fit your needs.
+They offers different strategies varying from the Stack to the Queue.
+
+However, it is really simple to create you own collection if needed, since MiddlewareCollectionInterface requires only 3 methods.
+
 #### Tests
 
 `composer test`
 
 ### References
 
 https://www.php-fig.org/psr/psr-15/
+
+## License
+
+This project is licensed under the MIT License - see the [LICENSE.md](LICENSE.md) file for details