add README.md to project

Author: joonlabs

README.md

@@ -0,0 +1,58 @@
+<p align="center">
+    <img src="https://joonlabs.com/php-graphql/logo.svg" alt="index.js logo" width="300" align="center" style="width: 300px; display: block; margin-left: auto; margin-right: auto;"/>
+</p>
+
+# php-graphql
+
+php-graphql is a pure php implementation of the latest GraphQL [specification](https://github.com/graphql/graphql-spec) based on the [reference implementation in JavaScript](https://github.com/graphql/graphql-js). 
+
+## Installation
+**git clone:**
+````bash
+git clone https://github.com/joonlabs/php-graphql.git
+````
+after downloading include the autloader.php, e.g.:
+````php
+require 'php-graphql/src/autoloader.php';
+````
+## Hello world!
+
+```php
+use GraphQL\Servers\Server;
+use GraphQL\Schemas\Schema;
+use GraphQL\Types\GraphQLString;
+use GraphQL\Types\GraphQLObjectType;
+use GraphQL\Fields\GraphQLTypeField;
+use GraphQL\Arguments\GraphQLFieldArgument;
+
+// build the query type
+$QueryType = new GraphQLObjectType("Query", "Root Query", function (){
+    return [
+        new GraphQLTypeField(
+            "hello",
+            new GraphQLString(),
+            "Your first hello world GraphQL-Application",
+            function (){ return 'Hello world!'; }
+        )
+    ];
+});
+
+// build the schema
+$schema = new Schema($QueryType);
+
+// start a server
+$server = new Server($schema);
+$server->listen();
+```
+
+That's it! Now the GraphQL server is ready to accept requests at the URL of the PHP script.
+
+## Backers and sponsors
+<img src="https://joonlabs.com/php-graphql/backers/joon.png" alt="index.js logo" height="30"/><br>
+see [joonlabs.com](https://joonlabs.com) 
+<br>
+<br>
+<img src="https://joonlabs.com/php-graphql/backers/leafx.png" alt="index.js logo" height="30"/><br>
+see [leafx.de](https://leafx.de)
+<br>
+<br>