Add basic usage to readme

README.md

@@ -4,10 +4,52 @@
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+Small and simple Event Bus library.
+
+Narrator allows communication between components without requiring the component to explicitly depend on each other.
+
 ##Installation
 
 Using [Composer](http://getcomposer.org/):
 
 ```sh
 $ composer require narrator/narrator
 ```
+
+##Basic usage
+
+```php
+// Simple event object
+class UserRegistered {
+    private $userId;
+
+    private $userName;
+    // ...event data, constructor, getters
+}
+// Sample listener
+class UserRegisteredListener implements Listener {
+
+    public function handle($event, Meta $meta){
+        // send email, update model, etc
+    }
+}
+
+// create EventBus which will be responsible for managing events and listeners
+$eventBus = new BasicEventBus(new ClassNameExtractor());
+
+// create listener instance
+$listener = new UserRegisteredListener(...);
+// and register it in bus
+$eventBus->subscribe(UserRegistered::class, $listener);
+
+// create event
+$event = new UserRegistered(...);
+// and `emit` it to listeners
+$eventBus->emit($event);
+```
+
+##Testing
+To run unit tests use PHPUnit
+```
+$ ./vendor/bin/phpunit
+```