Improved doc, add extra parameter to role objects

README.md

@@ -54,3 +54,4 @@ Creating an ACL component is as easy as instantiating `Samshal\Acl`. The constru
 	$acl = new Acl();
 ```
 
+#### Adding objects (**Roles**, **Permission** and **Resources**) to the ACL.

src/Role/DefaultRole.php

@@ -26,12 +26,18 @@ class DefaultRole implements RoleInterface, ObjectInterface
      */
     protected $roleName;
 
+    /**
+     * @var string
+     */
+    protected $roleDescription;
+
     /**
      * {@inheritdoc}
      */
-    public function __construct(string $roleName)
+    public function __construct(string $roleName, string $roleDescription="")
     {
         $this->roleName = $roleName;
+        $this->roleDescription = $roleDescription;
     }
 
     /**
@@ -42,6 +48,14 @@ public function getName() : string
         return $this->roleName;
     }
 
+    /**
+     * {@inheritdoc}
+     */
+    public function getDescription() : string
+    {
+        return $this->roleDescription;
+    }
+
     /**
      * Returns the roleName when this class is treated as a string.
      */

src/Role/RoleInterface.php

@@ -19,4 +19,10 @@
  */
 interface RoleInterface
 {
+	/**
+	 * Returns the descriptionof a role object
+	 *
+	 * @return string
+	 */
+	public function getDescription() : string;
 }