This is create very simple project, with the web descriptor in src/main/webapp/WEB-INF/web.xml. This is where you configure the app, but at the moment there's on the display-name in, which if ever used is only used in IDEs and such descriptively. The src/main/webapp/index.jsp is just some simple HTML, bigger apps it would have java commands delimited with <% %>.
To run this quickly, instead of setting up Tomcat or whatever, you can install the jetty plugin for maven, allowing you to start a small web server to see the webapp quickly. Put this in your pom.xml within the build tag: