Not able to access graphql schema and resolver on localhost Xampp server

Please help me
I am not able to access graphql schema and resolver from the custome module on localhost Xampp Server

Here is my code

/etc/graphql/schema.graphqls

type Query {
    testHello: String @resolver(class: "modulename\modulename\Model\Resolver\TestHello")
}

Model/Resolver/TestHello.php

<?php
namespace ModulenameModuelnameModelResolver;

use MagentoFrameworkGraphQlQueryResolverInterface;
use MagentoFrameworkGraphQlSchemaTypeResolveInfo;
use MagentoFrameworkGraphQlConfigElementField;

class TestHello implements ResolverInterface
{
    public function resolve(
        Field $field,
        $context,
        ResolveInfo $info,
        array $value = null,
        array $args = null
    ) {
        return "Hello from GraphQL!";
    }
}

I have added in module.xml as well

<?xml version="1.0"?>
<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
        xsi:noNamespaceSchemaLocation="urn:magento:framework:Module/etc/module.xsd">
    <module name="modulename" setup_version="1.0.0">
     <sequence>
           <module name="Magento_Sales"/>
           <module name="Magento_GraphQl"/>
        </sequence>
       
    </module>
</config>

Test query

query {
  testHello
}

Please help and thanks in advance