In order to add the Polymer client module to your project, open it in CUBA Studio and click Create module > Create polymer client module on the Project Properties navigator tab. Studio will create the polymer-client module in the project and configure it in build.gradle. The module will contain an application stub that is able to connect to the REST API and login/logout user to the middleware.

After creating the module, start the application server and open http://localhost:8080/app-front in a web browser. You will be presented with a login form. After logging in, the main window with a vertical menu and responsive layout will be shown.

In order to create a UI screen working with an entity, select an entity in Studio navigator and click New > Polymer UI component. Select a template (e.g. Entity cards list with editor), fill in required properties and click Create. The web component will be created and added to the menu. Studio provides hot-deploy of Polymer components, so you just need to refresh the page in the browser and you will see the newly created screen in the menu.