custom contact us with dependency injection(DI).
|- src | |- Controller - MusicContactUsController.php | |- Form - MusicContactUsForm.php | |- MusicContactUsFormService.php |- templates - music-contact-us.html.twig |- tests | |- Controller - MusicContactUsControllerTest.php | |- src | |- Functional - LoadTest.php |- composer.json |- music_contact_us.info.yml |- music_contact_us.install |- music_contact_us.module |- music_contact_us.routing.yml |- music_contact_us.services.yml