Make practice problem 00 easier to understand

[kushpatel72]

• add a comment inside the method definition that says something like "This is the method definition. Write your code here."
• add a comment above the test cases that says something like "Test cases are below. Don't worry about being able to read them. The code you write inside the method definition should make the test cases print true when you run the file. If you see falses, you still have work to do!"

[ruggeri]

We did this.