This repo has a short example of how to test a Salesforce app with TestZeus and Applitools.
It's recommended that you use an IDE like Intellij IDEA since it has support for Maven (build systems), Java (programming language) and JUnit (testing framework).
Assuming you are using an IDE, you can either run AccountsTest.java
for a basic TestZeus test, or AccountsApplitoolsTest.java
for an example of TestZeus used with Applitools.