Fix typos

Author: dunglas

README.md

@@ -1,7 +1,8 @@
 # PHP Schema.org Model Scaffolding
 
-This tool instantly generate a PHP data model from [Schema.org](http://schema.org) vocabulary. Browse Schema.org, choose
-the types and properties you need, run our code generator and you're done! You get a fully featured PHP data model including:
+The [PHP Schema](http://php-schema.dunglas.com/) command line tool tool instantly generate a PHP data model from the [Schema.org](http://schema.org)
+vocabulary. Browse Schema.org, choose the types and properties you need, run our code generator and you're done! You get
+a fully featured PHP data model including:
 * A set of PHP entities with properties, constants (enum values), getters, setters, adders and removers. The class
 hierarchy provided by Schema.org will be translated to a PHP class hierarchy with parents as `abstract` classes. The generated
 code complies with [PSR](http://www.php-fig.org/) coding standards.