Wrong example in README.md

```php
$greetTool = Tool::make(
    'greet',
    'Greets a person by name',
    ['name' => ['type' => 'string', 'description' => 'Name to greet']],
);
```

1. The `description` argument must go after `inputSchema`.
2. The `inputSchema` array is incomplete according array shape.

```php
$transport = new StdioServerTransport();
```
1. Required parameter `loop` is missing.