added: pass transformer support when presenter are instancetiate

Author: nahid

README.md

@@ -0,0 +1,8 @@
+# Presento
+
+A data preparing and presenting package for PHP.
+
+## Why Presento?
+
+Presento is a simple but powerful tools for preparing and presenting data.
+When we build an API based application, we need transform before it present or response.

src/Presenter.php

@@ -5,12 +5,18 @@
 
 abstract class Presenter
 {
+    protected $transformer = null;
     protected $data = [];
     protected $generatedData = [];
 
-    public function __construct(array $data)
+    public function __construct(array $data, string $transformer = null)
     {
         $this->data = $data;
+        $this->transformer = $this->transformer();
+        if (!is_null($transformer)) {
+            $this->transformer = $transformer;
+        }
+
         $this->generatedData = $this->handle();
     }
 
@@ -95,7 +101,7 @@ public function process(array $data) : array
      */
     protected function transform(array $data) : array
     {
-        $transformerClass = $this->transformer();
+        $transformerClass = $this->transformer;
 
         if (!is_null($transformerClass)) {
             $transformer = new $transformerClass($data);