New example for server usage

Author: vladar

examples/03-server/README.md

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+# Hello world
+Same example as 01-hello-world, but uses 
+[Standard Http Server](http://webonyx.github.io/graphql-php/executing-queries/#using-server)
+instead of manual parsing of incoming data.
+
+### Run locally
+```
+php -S localhost:8080 ./graphql.php
+```
+
+### Try query
+```
+curl http://localhost:8080 -d '{"query": "query { echo(message: \"Hello World\") }" }'
+```
+
+### Try mutation
+```
+curl http://localhost:8080 -d '{"query": "mutation { sum(x: 2, y: 2) }" }'
+```

examples/03-server/graphql.php

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+<?php
+// Test this using following command
+// php -S localhost:8080 ./graphql.php &
+// curl http://localhost:8080 -d '{"query": "query { echo(message: \"Hello World\") }" }'
+// curl http://localhost:8080 -d '{"query": "mutation { sum(x: 2, y: 2) }" }'
+require_once __DIR__ . '/../../vendor/autoload.php';
+
+use GraphQL\Type\Definition\ObjectType;
+use GraphQL\Type\Definition\Type;
+use GraphQL\Type\Schema;
+use GraphQL\Server\StandardServer;
+
+try {
+    $queryType = new ObjectType([
+        'name' => 'Query',
+        'fields' => [
+            'echo' => [
+                'type' => Type::string(),
+                'args' => [
+                    'message' => ['type' => Type::string()],
+                ],
+                'resolve' => function ($root, $args) {
+                    return $root['prefix'] . $args['message'];
+                }
+            ],
+        ],
+    ]);
+
+    $mutationType = new ObjectType([
+        'name' => 'Calc',
+        'fields' => [
+            'sum' => [
+                'type' => Type::int(),
+                'args' => [
+                    'x' => ['type' => Type::int()],
+                    'y' => ['type' => Type::int()],
+                ],
+                'resolve' => function ($root, $args) {
+                    return $args['x'] + $args['y'];
+                },
+            ],
+        ],
+    ]);
+
+    // See docs on schema options:
+    // http://webonyx.github.io/graphql-php/type-system/schema/#configuration-options
+    $schema = new Schema([
+        'query' => $queryType,
+        'mutation' => $mutationType,
+    ]);
+
+    // See docs on server options:
+    // http://webonyx.github.io/graphql-php/executing-queries/#server-configuration-options
+    $server = new StandardServer([
+        'schema' => $schema
+    ]);
+
+    $server->handleRequest();
+} catch (\Exception $e) {
+    StandardServer::send500Error($e);
+}