update README.md

README.md

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 # graphql-payload-object
+> Simple Object to build graphql payload, and use your favourite http client to send.
+
+[![Latest Stable Version](https://poser.pugx.org/ilexn/graphql-payload-object/v/stable)](https://packagist.org/packages/ilexn/graphql-payload-object)
+[![Total Downloads](https://poser.pugx.org/ilexn/graphql-payload-object/downloads)](https://packagist.org/packages/ilexn/graphql-payload-object)
+
+[![Build Status](https://travis-ci.org/iLexN/graphql-payload-object.svg?branch=master)](https://travis-ci.org/iLexN/graphql-payload-object)
+![GitHub Action](https://github.com/iLexN/graphql-payload-object/workflows/CI%20Check/badge.svg)
+[![Coverage Status](https://coveralls.io/repos/github/iLexN/graphql-payload-object/badge.svg?branch=master)](https://coveralls.io/github/iLexN/graphql-payload-object?branch=master)
+[![Infection MSI](https://badge.stryker-mutator.io/github.com/iLexN/graphql-payload-object/master)](https://infection.github.io)
+
+## Installation
+```sh
+composer require ilexn/graphql-payload-object
+```
+
+## Usage example
+```php
+<?php
+declare(strict_types=1);
+
+require_once __DIR__ . '/../vendor/autoload.php';
+
+$query = <<<'QUERY'
+query HeroNameAndFriends($episode: Episode) {
+  hero(episode: $episode) {
+    name
+    friends {
+      name
+    }
+  }
+}
+QUERY;
+
+$variables = [
+    "episode" => "JEDI",
+];
+
+
+$payload = \Ilex\GraphqlPayloadObject\Payload::fromString($query, $variables);
+// or from path
+//$payload = \Ilex\GraphqlPayloadObject\Payload::fromPath('example.gql', $variables);
+
+$payload->addVariable('key', 'value');
+
+
+// use the same query , with different variable set
+$newPayload = $payload->withVariable([
+    'episode' => 'new episode',
+    'key' => 'new value',
+]);
+
+// Symfony HttpClient Component
+$client = Symfony\Component\HttpClient\HttpClient::create();
+$response = $client->request('POST',
+    'http://drupal.docker.localhost:8000/graphql/', [
+        'body' => $payload->toJson(),
+        // or
+        //'json' => $p->toArray(),
+    ]);
+var_dump($response->toArray());
+
+// Guzzle, PHP HTTP client
+$client = new GuzzleHttp\Client();
+$response = $client->post('http://drupal.docker.localhost:8000/graphql/', [
+    'body' => $payload->toJson(),
+    // or
+    //'json' => $p->toArray(),
+]);
+var_dump((string)$response->getBody());
+```