readme update

README.md

-# test-package
+# Package test OneStartup
+
+  **onestartup/calculator** it's a simple calculator created for test laravel packages
+
+# Installation
+
+- Add this to composer.json file
+```php
+	"onestartup/calculator": "~0.0.2"
+```
+and  run 
+```php
+composer update
+````
+
+- after add the ServiceProvider to the providers array in config/app.php
+```php
+Onestartup\Calculator\CalculatorServiceProvider::class,
+````
+- run serv
+```php
+php artisan serve
+```
+- test in this route
+```php
+http://localhost:8000/add/5/2
+```