The configuration to execute WildFly using Maven commands was causing
problems in Windows environments.

This problem has been fixed by upgrading the plugin version, which
implied rebuilding its configuration. As part of this change, the
configuration was also simplified, and now starting the application and
redeploying it is faster.

In addition, submodules that do not require WildFly to run the tests
no longer copy it. This reduces the execution time.

The REST layer has been added but with incomplete tests. Students will
have to complete the tests.

This commit includes an important refactorization regarding tests. Test
classes and datasets have been moved from the "service" project to a new
"tests" project. This way, any project can include this "tests" project
as a dependency in order to have access to these common testing
resources.

Initial commit with a basic .gitignore, README.md and POM files.