Add example output to documentation

[madthanu]

Problem: The current documentation describes the output of the alice-check tool, in a paragraph. However, many users end up getting an Exception (or other kinds of errors) when they run alice-check for the first time, and get confused whether this is the correct output of alice-check.

Suggested solution: Users (phoeagon mainly) suggest adding a screenshot of the alice-check output to the documentation. It is also a good idea to attach a screenshot of alice-check running into an error.