Put some more examples on usage

[schrepfler]

The current example of usage in the webdriver-tester Main class is not quite clear on how the webdriver is to be used, we can create a browser, we can start a session and execute javascript but what do we do next? Should we use the phantomjs api to execute operations? What's the point of that if we then have to execute line by line and then map the result back to scala?
Is there an API which the Session provides? Is there a way to pass in a recorded session (ex. har file or selenium recording) and automate that?