usernameCheck.js

/*
Username check (part 1):

We need a function called `doesUserExist` that will accept a user's username (string) and return a boolean value stating 
if the user already exists for our check.

`hint` - maybe take a look at https://www.w3schools.com/jsref/jsref_includes_array.asp .

For now use these usernames to check against:

const usernames = [
  "seanyboy",
  "loucat",
  "jakethesnake",
];

Here are some examples that sound work:

> doesUserExist("seanyboy")
true

> doesUserExist("newkid")
false

> doesUserExist("loucat")
true

*/