update readme

Author: harryolx

readme.md

@@ -22,7 +22,168 @@
 - *then run `composer install` or `composer update`*
 
 ## How To Use
-Check the use sample in the [test code](https://github.com/harryosmar/php-restful-api-response/blob/master/tests/unit/ResponseTest.php)
+- First instantiate the response object
+```
+<?php
+
+use PhpRestfulApiResponse\Response;
+
+$response = new Response();
+```
+- With simple array
+```
+<?php
+echo $response->withArray([
+    'status' => 'created',
+    'id' => 1
+], 201); //response code 201
+```
+```json
+{
+    "status": "created",
+    "id": 1
+}
+```
+- With item/object
+```
+<?php
+use PhpRestfulApiResponse\Tests\unit\Lib\Book;
+
+echo $response->withItem(
+    new Book('harry', 'harryosmarsitohang', 'how to be a ninja', 100000, 2017),
+    new \PhpRestfulApiResponse\Tests\unit\Lib\Transformer\Book,
+    200 //response code 200
+);
+```
+```json
+{
+    "data":
+    {
+        "title": "how to be a ninja",
+        "author":
+        {
+            "name": "harry",
+            "email": "harryosmarsitohang"
+        },
+        "year": 2017,
+        "price": 100000
+    }
+}
+```
+- With collection of items
+```
+<?php
+use PhpRestfulApiResponse\Tests\unit\Lib\Book;
+
+$response->withCollection(
+    [
+        new Book('harry', 'harryosmarsitohang', 'how to be a ninja', 100000, 2017),
+        new Book('harry', 'harryosmarsitohang', 'how to be a mage', 500000, 2016),
+        new Book('harry', 'harryosmarsitohang', 'how to be a samurai', 25000, 2000),
+    ],
+    new \PhpRestfulApiResponse\Tests\unit\Lib\Transformer\Book,
+    200
+);
+```
+```json
+{
+    "data": [
+    {
+        "title": "how to be a ninja",
+        "author":
+        {
+            "name": "harry",
+            "email": "harryosmarsitohang"
+        },
+        "year": 2017,
+        "price": 100000
+    },
+    {
+        "title": "how to be a mage",
+        "author":
+        {
+            "name": "harry",
+            "email": "harryosmarsitohang"
+        },
+        "year": 2016,
+        "price": 500000
+    },
+    {
+        "title": "how to be a samurai",
+        "author":
+        {
+            "name": "harry",
+            "email": "harryosmarsitohang"
+        },
+        "year": 2000,
+        "price": 25000
+    }]
+}
+```
+- 404 Not Found
+```
+<?php
+echo $response->errorNotFound();
+```
+```json
+{
+    "error":
+    {
+        "http_code": 404,
+        "phrase": "Not Found"
+    }
+}
+```
+- 500 Internal Server Error
+```
+<?php
+echo $response->errorInternalError();
+```
+```json
+{
+    "error":
+    {
+        "http_code": 500,
+        "phrase": "Internal Server Error"
+    }
+}
+```
+- 400 Bad Request
+```
+<?php
+echo $response->errorWrongArgs([
+   'username' => 'required',
+   'password' => 'required'
+]);
+```
+```json
+{
+    "error":
+    {
+        "http_code": 400,
+        "phrase": "Bad Request",
+        "message":
+        {
+            "username": "required",
+            "password": "required"
+        }
+    }
+}
+```
+- 401 Unauthorized
+```
+<?php
+echo $response->errorUnauthorized();
+```
+```json
+{
+    "error":
+    {
+        "http_code": 401,
+        "phrase": "Unauthorized"
+    }
+}
+```
 
 ## How To Run The Test
 ```