In order to build the game, move to the root directory of this project and run the following command. This will generate the target directory
mvn package

In order to run the game and run the following command from the root directory of this project after building
java -jar target/project-1.0-SNAPSHOT.jar

In order to test the game, run the following command from the root directory of this project.
mvn test

In order to build the javadoc documentation, run the following command from the root directory of this project, this will create the javadoc html files in the directory target/site/apidocs
mvn javadoc:javadoc