Root project for Vaadin archetypes

Run the following command providing the version of vaadin to use in order to build and install the archetype in your local maven repository:

mvn clean install "-Dvaadin.version=20.0.3"

Go to the folder you want to create your new project and run:

mvn archetype:generate -DarchetypeCatalog=local

Answer the questions to configure your application, and finally go to the new application folder and run mvn to start the application.