add method that finds foundation namespace to finder

Author: Mulkave

src/Finder.php

@@ -42,6 +42,16 @@ public function findRootNamespace()
         throw Exception('App namespace not set in composer.json');
     }
 
+    /**
+     * Find the namespace of the foundation.
+     *
+     * @return string
+     */
+    public function findFoundationNamespace()
+    {
+        return $this->findRootNamespace().'\Foundation';
+    }
+
     /**
      * Find the namespace for the given service name.
      *