Update LdapAdapter.php

provide static function for instantiation

model/LdapAdapter.php

@@ -57,6 +57,16 @@ class LdapAdapter implements LoginAdapter
      * @var \Zend\Authentication\Adapter\Ldap
      */
     protected $adapter;
+    
+    /**
+     * Create an adapter from the configuration
+     * 
+     * @param array $configuration
+     * @return \oat\authKeyValue\model\AuthKeyValueAdapter
+     */
+    public static function createFromConfig(array $configuration) {
+        return new self($configuration);
+    }
 
     /**
      * @param array $configuration
@@ -174,4 +184,4 @@ class LdapAdapter implements LoginAdapter
     }
 
 
-}
+}