added README

Author: kohlerdominik

README.md

@@ -1,2 +1,19 @@
 # laravel-formrequest-singleton
 Use Laravel's excellent FormRequest as Singleton
+
+## Installation
+
+*   run `composer require lextira/laravel-formrequest-singleton`
+*   open `config/app.php` in your project
+*   replace `Illuminate\Foundation\Providers\FoundationServiceProvider::class`  
+    with `Lextira\FormRequestSingleton\FoundationServiceProvider::class`
+*   done!
+
+## Usage
+
+All classes, which extend `Illuminate\Foundation\Http\FormRequest` are now instantiated as singleton.
+
+This brings the following benefits:
+*   Changes done to the request by `prepareForValidation()` are applied only once,
+    even if the FormRequest is used multiple times.
+*   The request validation is run only once, therefore especially database queries run only once.