how to create jdl file?
["simply creating a file with the extension '. jh' or '. ... ", 'declare your entities and relationships or create and download the file with JDL-Studio,', "in your JHipster application's root folder, simply run jhipster:import-jdl yourfile. jh ,", 'you can also use JDL files in JHipster UML with jhipster-uml my_file. jdl .']